diff --git a/TODO.md b/TODO.md
index 05fd765..8d54b8e 100644
--- a/TODO.md
+++ b/TODO.md
@@ -10,5 +10,4 @@ General TODO file of things left to implement.
 Entities:
 
 - x-cortex-infra (AWS, GCP, etc)
-- OpenAPI docs
 - Packages
diff --git a/docs/resources/catalog_entity_openapi.md b/docs/resources/catalog_entity_openapi.md
new file mode 100644
index 0000000..f223c08
--- /dev/null
+++ b/docs/resources/catalog_entity_openapi.md
@@ -0,0 +1,25 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "cortex_catalog_entity_openapi Resource - terraform-provider-cortex"
+subcategory: ""
+description: |-
+  Manages OpenAPI specifications for Cortex catalog entities.
+---
+
+# cortex_catalog_entity_openapi (Resource)
+
+Manages OpenAPI specifications for Cortex catalog entities.
+
+
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `entity_tag` (String) The tag or ID of the catalog entity that the OpenAPI specification will be associated with.
+- `spec` (String) The OpenAPI specification in YAML or JSON format.
+
+### Read-Only
+
+- `id` (String) The ID of the OpenAPI specification.
diff --git a/examples/resources/catalog_entity_openapi/resource.tf b/examples/resources/catalog_entity_openapi/resource.tf
new file mode 100644
index 0000000..915fd41
--- /dev/null
+++ b/examples/resources/catalog_entity_openapi/resource.tf
@@ -0,0 +1,35 @@
+terraform {
+  required_providers {
+    cortex = {
+      source = "cortexlocal/cortex"
+    }
+  }
+}
+
+provider "cortex" {
+  token = "access-token-here"
+}
+
+resource "cortex_catalog_entity_openapi" "test_service_oas1" {
+  entity_tag = "test-service"
+  spec       = <<EOF
+{
+    "openapi": "3.0.0",
+    "info": {
+        "title": "test-service",
+        "version": "1.0.0"
+    },
+    "paths": {
+        "/test": {
+            "get": {
+                "responses": {
+                    "200": {
+                        "description": "OK"
+                    }
+                }
+            }
+        }
+    }
+}
+EOF
+}
\ No newline at end of file
diff --git a/internal/cortex/catalog_entity_openapi.go b/internal/cortex/catalog_entity_openapi.go
new file mode 100644
index 0000000..8916a0c
--- /dev/null
+++ b/internal/cortex/catalog_entity_openapi.go
@@ -0,0 +1,114 @@
+package cortex
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/dghubble/sling"
+)
+
+type CatalogEntityOpenAPIClientInterface interface {
+	Get(ctx context.Context, entityTag string) (CatalogEntityOpenAPI, error)
+	Upsert(ctx context.Context, entityTag string, req UpsertCatalogEntityOpenAPIRequest) (CatalogEntityOpenAPI, error)
+	Delete(ctx context.Context, entityTag string) error
+}
+
+type CatalogEntityOpenAPIClient struct {
+	client *HttpClient
+}
+
+var _ CatalogEntityOpenAPIClientInterface = &CatalogEntityOpenAPIClient{}
+
+func (c *CatalogEntityOpenAPIClient) Client() *sling.Sling {
+	return c.client.Client()
+}
+
+/***********************************************************************************************************************
+ * Types
+ **********************************************************************************************************************/
+
+type CatalogEntityOpenAPI struct {
+	Tag  string `json:"tag"`  // tag of catalog entity
+	Spec string `json:"spec"` // OpenAPI specification
+}
+
+func (c *CatalogEntityOpenAPI) ID() string {
+	return c.Tag
+}
+
+/***********************************************************************************************************************
+ * GET /api/v1/catalog/:tag/documentation/openapi
+ **********************************************************************************************************************/
+
+func (c *CatalogEntityOpenAPIClient) Get(ctx context.Context, entityTag string) (CatalogEntityOpenAPI, error) {
+	entity := CatalogEntityOpenAPI{}
+	apiError := ApiError{}
+	response, err := c.Client().Get(Route("catalog_entities", entityTag+"/documentation/openapi")).Receive(&entity, &apiError)
+	if err != nil {
+		return entity, errors.New("could not get catalog entity OpenAPI spec: " + err.Error())
+	}
+
+	err = c.client.handleResponseStatus(response, &apiError)
+	if err != nil {
+		return entity, errors.Join(errors.New("failed getting catalog entity OpenAPI spec: "), err)
+	}
+
+	entity.Tag = entityTag
+	return entity, nil
+}
+
+/***********************************************************************************************************************
+ * POST /api/v1/catalog/:tag/documentation/openapi
+ **********************************************************************************************************************/
+
+type UpsertCatalogEntityOpenAPIRequest struct {
+	Spec  string `json:"spec"`
+	Force bool   `json:"force" url:"force,omitempty"`
+}
+
+func (c *CatalogEntityOpenAPI) ToUpsertRequest() UpsertCatalogEntityOpenAPIRequest {
+	return UpsertCatalogEntityOpenAPIRequest{
+		Spec: c.Spec,
+	}
+}
+
+func (c *CatalogEntityOpenAPIClient) Upsert(ctx context.Context, entityTag string, req UpsertCatalogEntityOpenAPIRequest) (CatalogEntityOpenAPI, error) {
+	entity := CatalogEntityOpenAPI{}
+	apiError := ApiError{}
+
+	req.Force = true
+
+	body, err := c.Client().Put(Route("catalog_entities", entityTag+"/documentation/openapi")).BodyJSON(&req).Receive(&entity, &apiError)
+	if err != nil {
+		return entity, fmt.Errorf("failed upserting OpenAPI spec for entity: %+v", err)
+	}
+
+	err = c.client.handleResponseStatus(body, &apiError)
+	if err != nil {
+		return entity, err
+	}
+
+	entity.Tag = entityTag
+	return entity, nil
+}
+
+/***********************************************************************************************************************
+ * DELETE /api/v1/catalog/:tag/documentation/openapi
+ **********************************************************************************************************************/
+
+func (c *CatalogEntityOpenAPIClient) Delete(ctx context.Context, entityTag string) error {
+	apiError := ApiError{}
+
+	response, err := c.Client().Delete(Route("catalog_entities", entityTag+"/documentation/openapi")).Receive(nil, &apiError)
+	if err != nil {
+		return errors.New("could not delete OpenAPI spec: " + err.Error())
+	}
+
+	err = c.client.handleResponseStatus(response, &apiError)
+	if err != nil {
+		return errors.Join(errors.New("failed deleting OpenAPI spec: "), err)
+	}
+
+	return nil
+}
diff --git a/internal/cortex/catalog_entity_openapi_test.go b/internal/cortex/catalog_entity_openapi_test.go
new file mode 100644
index 0000000..0328140
--- /dev/null
+++ b/internal/cortex/catalog_entity_openapi_test.go
@@ -0,0 +1,76 @@
+package cortex_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/cortexapps/terraform-provider-cortex/internal/cortex"
+	"github.com/stretchr/testify/assert"
+)
+
+var testOpenAPISpec = &cortex.CatalogEntityOpenAPI{
+	Tag: "test-catalog-entity",
+	Spec: `openapi: 3.0.0
+info:
+  title: Test API
+  version: 1.0.0
+paths:
+  /test:
+    get:
+      responses:
+        '200':
+          description: OK`,
+}
+
+func TestGetCatalogEntityOpenAPI(t *testing.T) {
+	tag := testOpenAPISpec.Tag
+	c, teardown, err := setupClient(
+		cortex.Route("catalog_entities", tag+"/documentation/openapi"),
+		testOpenAPISpec,
+		AssertRequestMethod(t, "GET"),
+	)
+	assert.Nil(t, err, "could not setup client")
+	defer teardown()
+
+	res, err := c.CatalogEntityOpenAPI().Get(context.Background(), tag)
+	assert.Nil(t, err, "error retrieving catalog entity OpenAPI spec")
+	assert.Equal(t, testOpenAPISpec.Tag, res.Tag)
+	assert.Equal(t, testOpenAPISpec.Spec, res.Spec)
+}
+
+func TestUpsertCatalogEntityOpenAPI(t *testing.T) {
+	tag := testOpenAPISpec.Tag
+	req := cortex.UpsertCatalogEntityOpenAPIRequest{
+		Spec:  testOpenAPISpec.Spec,
+		Force: true,
+	}
+	c, teardown, err := setupClient(
+		cortex.Route("catalog_entities", tag+"/documentation/openapi"),
+		testOpenAPISpec,
+		AssertRequestMethod(t, "PUT"),
+		AssertRequestBody(t, req),
+	)
+	assert.Nil(t, err, "could not setup client")
+	defer teardown()
+
+	updatedSpec, err := c.CatalogEntityOpenAPI().Upsert(context.Background(), tag, req)
+	assert.Nil(t, err, "error upserting catalog entity OpenAPI spec")
+	assert.Equal(t, updatedSpec.Tag, tag)
+	assert.Equal(t, updatedSpec.Spec, req.Spec)
+}
+
+func TestDeleteCatalogEntityOpenAPI(t *testing.T) {
+	tag := testOpenAPISpec.Tag
+
+	c, teardown, err := setupClient(
+		cortex.Route("catalog_entities", tag+"/documentation/openapi"),
+		nil,
+		AssertRequestMethod(t, "DELETE"),
+		AssertRequestURI(t, "/api/v1/catalog/"+tag+"/documentation/openapi"),
+	)
+	assert.Nil(t, err, "could not setup client")
+	defer teardown()
+
+	err = c.CatalogEntityOpenAPI().Delete(context.Background(), tag)
+	assert.Nil(t, err, "error deleting catalog entity OpenAPI spec")
+}
diff --git a/internal/cortex/http_client.go b/internal/cortex/http_client.go
index 29a0724..c22ba12 100644
--- a/internal/cortex/http_client.go
+++ b/internal/cortex/http_client.go
@@ -4,12 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/dghubble/sling"
-	"github.com/motemen/go-loghttp"
-	_ "github.com/motemen/go-loghttp/global" // Just this line!
 	"net/http"
 	"net/url"
 	"os"
+
+	"github.com/dghubble/sling"
+	"github.com/motemen/go-loghttp"
+	_ "github.com/motemen/go-loghttp/global" // Just this line!
 )
 
 const (
@@ -153,6 +154,10 @@ func (c *HttpClient) CatalogEntityCustomData() CatalogEntityCustomDataClientInte
 	return &CatalogEntityCustomDataClient{client: c}
 }
 
+func (c *HttpClient) CatalogEntityOpenAPI() CatalogEntityOpenAPIClientInterface {
+	return &CatalogEntityOpenAPIClient{client: c}
+}
+
 func (c *HttpClient) Teams() TeamsClientInterface {
 	return &TeamsClient{client: c}
 }
diff --git a/internal/provider/catalog_entity_openapi_resource.go b/internal/provider/catalog_entity_openapi_resource.go
new file mode 100644
index 0000000..f8e32da
--- /dev/null
+++ b/internal/provider/catalog_entity_openapi_resource.go
@@ -0,0 +1,181 @@
+package provider
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/cortexapps/terraform-provider-cortex/internal/cortex"
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
+	"github.com/hashicorp/terraform-plugin-framework/types"
+)
+
+var (
+	_ resource.Resource                = &CatalogEntityOpenAPIResource{}
+	_ resource.ResourceWithConfigure   = &CatalogEntityOpenAPIResource{}
+	_ resource.ResourceWithImportState = &CatalogEntityOpenAPIResource{}
+)
+
+type CatalogEntityOpenAPIResource struct {
+	client *cortex.HttpClient
+}
+
+type CatalogEntityOpenAPIResourceModel struct {
+	EntityTag types.String `tfsdk:"entity_tag"`
+	Spec      types.String `tfsdk:"spec"`
+	Id        types.String `tfsdk:"id"`
+}
+
+func NewCatalogEntityOpenAPIResource() resource.Resource {
+	return &CatalogEntityOpenAPIResource{}
+}
+
+func (r *CatalogEntityOpenAPIResource) Configure(_ context.Context, req resource.ConfigureRequest, resp *resource.ConfigureResponse) {
+	if req.ProviderData == nil {
+		return
+	}
+
+	client, ok := req.ProviderData.(*cortex.HttpClient)
+	if !ok {
+		resp.Diagnostics.AddError(
+			"Unexpected Data Source Configure Type",
+			fmt.Sprintf("Expected *cortex.Client, got: %T. Please report this issue to the provider developers.", req.ProviderData),
+		)
+		return
+	}
+
+	r.client = client
+}
+
+func (r *CatalogEntityOpenAPIResource) Metadata(_ context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
+	resp.TypeName = req.ProviderTypeName + "_catalog_entity_openapi"
+}
+
+func (r *CatalogEntityOpenAPIResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
+	resp.Schema = schema.Schema{
+		Description: "Manages OpenAPI specifications for Cortex catalog entities.",
+		Attributes: map[string]schema.Attribute{
+			"entity_tag": schema.StringAttribute{
+				Description: "The tag or ID of the catalog entity that the OpenAPI specification will be associated with.",
+				Required:    true,
+				PlanModifiers: []planmodifier.String{
+					stringplanmodifier.RequiresReplace(),
+				},
+			},
+			"spec": schema.StringAttribute{
+				Description: "The OpenAPI specification in YAML or JSON format.",
+				Required:    true,
+			},
+			"id": schema.StringAttribute{
+				Description: "The ID of the OpenAPI specification.",
+				Computed:    true,
+				PlanModifiers: []planmodifier.String{
+					stringplanmodifier.UseStateForUnknown(),
+				},
+			},
+		},
+	}
+}
+
+func (r *CatalogEntityOpenAPIResource) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
+	var plan CatalogEntityOpenAPIResourceModel
+	diags := req.Plan.Get(ctx, &plan)
+	resp.Diagnostics.Append(diags...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	openAPISpec, err := r.client.CatalogEntityOpenAPI().Upsert(ctx, plan.EntityTag.ValueString(), cortex.UpsertCatalogEntityOpenAPIRequest{
+		Spec: plan.Spec.ValueString(),
+	})
+	if err != nil {
+		resp.Diagnostics.AddError(
+			"Error creating OpenAPI specification",
+			fmt.Sprintf("Could not create OpenAPI specification: %s", err.Error()),
+		)
+		return
+	}
+
+	plan.Id = types.StringValue(openAPISpec.ID())
+	diags = resp.State.Set(ctx, plan)
+	resp.Diagnostics.Append(diags...)
+}
+
+func (r *CatalogEntityOpenAPIResource) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
+	var state CatalogEntityOpenAPIResourceModel
+	diags := req.State.Get(ctx, &state)
+	resp.Diagnostics.Append(diags...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	openAPISpec, err := r.client.CatalogEntityOpenAPI().Get(ctx, state.EntityTag.ValueString())
+	if err != nil {
+		if strings.Contains(err.Error(), "not found") {
+			resp.State.RemoveResource(ctx)
+			return
+		}
+
+		resp.Diagnostics.AddError(
+			"Error reading OpenAPI specification",
+			fmt.Sprintf("Could not read OpenAPI specification: %s", err.Error()),
+		)
+		return
+	}
+
+	state.Spec = types.StringValue(openAPISpec.Spec)
+	state.Id = types.StringValue(openAPISpec.ID())
+
+	diags = resp.State.Set(ctx, state)
+	resp.Diagnostics.Append(diags...)
+}
+
+func (r *CatalogEntityOpenAPIResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
+	var plan CatalogEntityOpenAPIResourceModel
+	diags := req.Plan.Get(ctx, &plan)
+	resp.Diagnostics.Append(diags...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	openAPISpec, err := r.client.CatalogEntityOpenAPI().Upsert(ctx, plan.EntityTag.ValueString(), cortex.UpsertCatalogEntityOpenAPIRequest{
+		Spec: plan.Spec.ValueString(),
+	})
+	if err != nil {
+		resp.Diagnostics.AddError(
+			"Error updating OpenAPI specification",
+			fmt.Sprintf("Could not update OpenAPI specification: %s", err.Error()),
+		)
+		return
+	}
+
+	plan.Id = types.StringValue(openAPISpec.ID())
+	diags = resp.State.Set(ctx, plan)
+	resp.Diagnostics.Append(diags...)
+}
+
+func (r *CatalogEntityOpenAPIResource) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
+	var state CatalogEntityOpenAPIResourceModel
+	diags := req.State.Get(ctx, &state)
+	resp.Diagnostics.Append(diags...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	err := r.client.CatalogEntityOpenAPI().Delete(ctx, state.EntityTag.ValueString())
+	if err != nil {
+		resp.Diagnostics.AddError(
+			"Error deleting OpenAPI specification",
+			fmt.Sprintf("Could not delete OpenAPI specification: %s", err.Error()),
+		)
+		return
+	}
+}
+
+func (r *CatalogEntityOpenAPIResource) ImportState(ctx context.Context, req resource.ImportStateRequest, resp *resource.ImportStateResponse) {
+	resource.ImportStatePassthroughID(ctx, path.Root("entity_tag"), req, resp)
+}
diff --git a/internal/provider/catalog_entity_openapi_resource_test.go b/internal/provider/catalog_entity_openapi_resource_test.go
new file mode 100644
index 0000000..a6d5475
--- /dev/null
+++ b/internal/provider/catalog_entity_openapi_resource_test.go
@@ -0,0 +1,73 @@
+package provider_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
+)
+
+func TestAccCatalogEntityOpenAPIResource(t *testing.T) {
+	entityTag := "test-service"
+	spec := `openapi: 3.0.0
+info:
+  title: Test API
+  version: 1.0.0
+paths:
+  /test:
+    get:
+      responses:
+        '200':
+          description: OK`
+
+	updatedSpec := `openapi: 3.0.0
+info:
+  title: Updated Test API
+  version: 1.0.1
+paths:
+  /test:
+    get:
+      responses:
+        '200':
+          description: OK`
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:                 func() { testAccPreCheck(t) },
+		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
+		Steps: []resource.TestStep{
+			// Create and Read testing
+			{
+				Config: testAccCatalogEntityOpenAPIResourceConfig(entityTag, spec),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("cortex_catalog_entity_openapi.test", "entity_tag", entityTag),
+					resource.TestCheckResourceAttr("cortex_catalog_entity_openapi.test", "spec", spec),
+					resource.TestCheckResourceAttr("cortex_catalog_entity_openapi.test", "id", entityTag),
+				),
+			},
+			// ImportState testing
+			{
+				ResourceName:      "cortex_catalog_entity_openapi.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			// Update and Read testing
+			{
+				Config: testAccCatalogEntityOpenAPIResourceConfig(entityTag, updatedSpec),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("cortex_catalog_entity_openapi.test", "entity_tag", entityTag),
+					resource.TestCheckResourceAttr("cortex_catalog_entity_openapi.test", "spec", updatedSpec),
+				),
+			},
+			// Delete testing automatically occurs in TestCase
+		},
+	})
+}
+
+func testAccCatalogEntityOpenAPIResourceConfig(entityTag string, spec string) string {
+	return fmt.Sprintf(`
+resource "cortex_catalog_entity_openapi" "test" {
+  entity_tag = %[1]q
+  spec       = %[2]q
+}
+`, entityTag, spec)
+}
diff --git a/internal/provider/provider.go b/internal/provider/provider.go
index 797839e..3909bb4 100644
--- a/internal/provider/provider.go
+++ b/internal/provider/provider.go
@@ -106,6 +106,7 @@ func (p *CortexProvider) Resources(ctx context.Context) []func() resource.Resour
 		NewScorecardResource,
 		NewResourceDefinitionResource,
 		NewCatalogEntityCustomDataResource,
+		NewCatalogEntityOpenAPIResource,
 	}
 }