diff --git a/api/apiv1/design/cluster.go b/api/apiv1/design/cluster.go
index 0bd4836f..6b593371 100644
--- a/api/apiv1/design/cluster.go
+++ b/api/apiv1/design/cluster.go
@@ -18,10 +18,6 @@ var Cluster = g.Type("Cluster", func() {
 		g.Description("Unique identifier for the cluster.")
 		g.Example("production")
 	})
-	g.Attribute("tenant_id", Identifier, func() {
-		g.Description("Unique identifier for the cluster's owner.")
-		g.Example("engineering")
-	})
 	g.Attribute("status", ClusterStatus, func() {
 		g.Description("Current status of the cluster.")
 	})
@@ -30,7 +26,7 @@ var Cluster = g.Type("Cluster", func() {
 		g.Example(HostsArrayExample)
 	})
 
-	g.Required("id", "tenant_id", "status", "hosts")
+	g.Required("id", "status", "hosts")
 })
 
 var InitClusterRequest = g.Type("InitClusterRequest", func() {
diff --git a/api/apiv1/gen/control_plane/service.go b/api/apiv1/gen/control_plane/service.go
index e5c2d640..a6383fc9 100644
--- a/api/apiv1/gen/control_plane/service.go
+++ b/api/apiv1/gen/control_plane/service.go
@@ -205,8 +205,6 @@ type CancelDatabaseTaskPayload struct {
 type Cluster struct {
 	// Unique identifier for the cluster.
 	ID Identifier
-	// Unique identifier for the cluster's owner.
-	TenantID Identifier
 	// Current status of the cluster.
 	Status *ClusterStatus
 	// All of the hosts in the cluster.
diff --git a/api/apiv1/gen/http/control_plane/client/types.go b/api/apiv1/gen/http/control_plane/client/types.go
index 7643fa3f..41607c3a 100644
--- a/api/apiv1/gen/http/control_plane/client/types.go
+++ b/api/apiv1/gen/http/control_plane/client/types.go
@@ -132,8 +132,6 @@ type GetJoinOptionsResponseBody struct {
 type GetClusterResponseBody struct {
 	// Unique identifier for the cluster.
 	ID *string `form:"id,omitempty" json:"id,omitempty" xml:"id,omitempty"`
-	// Unique identifier for the cluster's owner.
-	TenantID *string `form:"tenant_id,omitempty" json:"tenant_id,omitempty" xml:"tenant_id,omitempty"`
 	// Current status of the cluster.
 	Status *ClusterStatusResponseBody `form:"status,omitempty" json:"status,omitempty" xml:"status,omitempty"`
 	// All of the hosts in the cluster.
@@ -2708,8 +2706,7 @@ func NewGetJoinOptionsServerError(body *GetJoinOptionsServerErrorResponseBody) *
 // endpoint result from a HTTP "OK" response.
 func NewGetClusterClusterOK(body *GetClusterResponseBody) *controlplane.Cluster {
 	v := &controlplane.Cluster{
-		ID:       controlplane.Identifier(*body.ID),
-		TenantID: controlplane.Identifier(*body.TenantID),
+		ID: controlplane.Identifier(*body.ID),
 	}
 	v.Status = unmarshalClusterStatusResponseBodyToControlplaneClusterStatus(body.Status)
 	v.Hosts = make([]*controlplane.Host, len(body.Hosts))
@@ -4011,9 +4008,6 @@ func ValidateGetClusterResponseBody(body *GetClusterResponseBody) (err error) {
 	if body.ID == nil {
 		err = goa.MergeErrors(err, goa.MissingFieldError("id", "body"))
 	}
-	if body.TenantID == nil {
-		err = goa.MergeErrors(err, goa.MissingFieldError("tenant_id", "body"))
-	}
 	if body.Status == nil {
 		err = goa.MergeErrors(err, goa.MissingFieldError("status", "body"))
 	}
@@ -4030,16 +4024,6 @@ func ValidateGetClusterResponseBody(body *GetClusterResponseBody) (err error) {
 			err = goa.MergeErrors(err, goa.InvalidLengthError("body.id", *body.ID, utf8.RuneCountInString(*body.ID), 63, false))
 		}
 	}
-	if body.TenantID != nil {
-		if utf8.RuneCountInString(*body.TenantID) < 1 {
-			err = goa.MergeErrors(err, goa.InvalidLengthError("body.tenant_id", *body.TenantID, utf8.RuneCountInString(*body.TenantID), 1, true))
-		}
-	}
-	if body.TenantID != nil {
-		if utf8.RuneCountInString(*body.TenantID) > 63 {
-			err = goa.MergeErrors(err, goa.InvalidLengthError("body.tenant_id", *body.TenantID, utf8.RuneCountInString(*body.TenantID), 63, false))
-		}
-	}
 	if body.Status != nil {
 		if err2 := ValidateClusterStatusResponseBody(body.Status); err2 != nil {
 			err = goa.MergeErrors(err, err2)
diff --git a/api/apiv1/gen/http/control_plane/server/types.go b/api/apiv1/gen/http/control_plane/server/types.go
index bb70c8da..04832a5c 100644
--- a/api/apiv1/gen/http/control_plane/server/types.go
+++ b/api/apiv1/gen/http/control_plane/server/types.go
@@ -132,8 +132,6 @@ type GetJoinOptionsResponseBody struct {
 type GetClusterResponseBody struct {
 	// Unique identifier for the cluster.
 	ID string `form:"id" json:"id" xml:"id"`
-	// Unique identifier for the cluster's owner.
-	TenantID string `form:"tenant_id" json:"tenant_id" xml:"tenant_id"`
 	// Current status of the cluster.
 	Status *ClusterStatusResponseBody `form:"status" json:"status" xml:"status"`
 	// All of the hosts in the cluster.
@@ -2474,8 +2472,7 @@ func NewGetJoinOptionsResponseBody(res *controlplane.ClusterJoinOptions) *GetJoi
 // the "get-cluster" endpoint of the "control-plane" service.
 func NewGetClusterResponseBody(res *controlplane.Cluster) *GetClusterResponseBody {
 	body := &GetClusterResponseBody{
-		ID:       string(res.ID),
-		TenantID: string(res.TenantID),
+		ID: string(res.ID),
 	}
 	if res.Status != nil {
 		body.Status = marshalControlplaneClusterStatusToClusterStatusResponseBody(res.Status)
diff --git a/api/apiv1/gen/http/openapi.json b/api/apiv1/gen/http/openapi.json
index 7471427e..af637e1b 100644
--- a/api/apiv1/gen/http/openapi.json
+++ b/api/apiv1/gen/http/openapi.json
@@ -32,7 +32,6 @@
               "$ref": "#/definitions/Cluster",
               "required": [
                 "id",
-                "tenant_id",
                 "status",
                 "hosts"
               ]
@@ -2439,13 +2438,6 @@
         },
         "status": {
           "$ref": "#/definitions/ClusterStatus"
-        },
-        "tenant_id": {
-          "type": "string",
-          "description": "Unique identifier for the cluster's owner.",
-          "example": "engineering",
-          "minLength": 1,
-          "maxLength": 63
         }
       },
       "example": {
@@ -2568,12 +2560,10 @@
         "id": "production",
         "status": {
           "state": "available"
-        },
-        "tenant_id": "engineering"
+        }
       },
       "required": [
         "id",
-        "tenant_id",
         "status",
         "hosts"
       ]
diff --git a/api/apiv1/gen/http/openapi.yaml b/api/apiv1/gen/http/openapi.yaml
index 1a319bd3..2a770f45 100644
--- a/api/apiv1/gen/http/openapi.yaml
+++ b/api/apiv1/gen/http/openapi.yaml
@@ -27,7 +27,6 @@ paths:
             $ref: '#/definitions/Cluster'
             required:
               - id
-              - tenant_id
               - status
               - hosts
         "409":
@@ -1741,12 +1740,6 @@ definitions:
         maxLength: 63
       status:
         $ref: '#/definitions/ClusterStatus'
-      tenant_id:
-        type: string
-        description: Unique identifier for the cluster's owner.
-        example: engineering
-        minLength: 1
-        maxLength: 63
     example:
       hosts:
         - cohort:
@@ -1830,10 +1823,8 @@ definitions:
       id: production
       status:
         state: available
-      tenant_id: engineering
     required:
       - id
-      - tenant_id
       - status
       - hosts
   ClusterJoinToken:
diff --git a/api/apiv1/gen/http/openapi3.json b/api/apiv1/gen/http/openapi3.json
index 56dc3080..4b65609c 100644
--- a/api/apiv1/gen/http/openapi3.json
+++ b/api/apiv1/gen/http/openapi3.json
@@ -147,8 +147,7 @@
                   "id": "production",
                   "status": {
                     "state": "available"
-                  },
-                  "tenant_id": "engineering"
+                  }
                 }
               }
             }
@@ -4777,13 +4776,6 @@
           },
           "status": {
             "$ref": "#/components/schemas/ClusterStatus"
-          },
-          "tenant_id": {
-            "type": "string",
-            "description": "A user-specified identifier. Must be 1-63 characters, contain only lower-cased letters and hyphens, start and end with a letter or number, and not contain consecutive hyphens.",
-            "example": "76f9b8c0-4958-11f0-a489-3bb29577c696",
-            "minLength": 1,
-            "maxLength": 63
           }
         },
         "example": {
@@ -4906,12 +4898,10 @@
           "id": "production",
           "status": {
             "state": "available"
-          },
-          "tenant_id": "engineering"
+          }
         },
         "required": [
           "id",
-          "tenant_id",
           "status",
           "hosts"
         ]
diff --git a/api/apiv1/gen/http/openapi3.yaml b/api/apiv1/gen/http/openapi3.yaml
index af2b93dd..c5a85ff2 100644
--- a/api/apiv1/gen/http/openapi3.yaml
+++ b/api/apiv1/gen/http/openapi3.yaml
@@ -103,7 +103,6 @@ paths:
                 id: production
                 status:
                   state: available
-                tenant_id: engineering
         "409":
           description: 'cluster_not_initialized: Conflict response.'
           content:
@@ -3246,12 +3245,6 @@ components:
           maxLength: 63
         status:
           $ref: '#/components/schemas/ClusterStatus'
-        tenant_id:
-          type: string
-          description: A user-specified identifier. Must be 1-63 characters, contain only lower-cased letters and hyphens, start and end with a letter or number, and not contain consecutive hyphens.
-          example: 76f9b8c0-4958-11f0-a489-3bb29577c696
-          minLength: 1
-          maxLength: 63
       example:
         hosts:
           - cohort:
@@ -3335,10 +3328,8 @@ components:
         id: production
         status:
           state: available
-        tenant_id: engineering
       required:
         - id
-        - tenant_id
         - status
         - hosts
     ClusterCredentials:
diff --git a/changes/unreleased/Removed-20251222-093048.yaml b/changes/unreleased/Removed-20251222-093048.yaml
new file mode 100644
index 00000000..5e740484
--- /dev/null
+++ b/changes/unreleased/Removed-20251222-093048.yaml
@@ -0,0 +1,3 @@
+kind: Removed
+body: Removed unused "tenant_id" field from GetCluster endpoint.
+time: 2025-12-22T09:30:48.776635-06:00
diff --git a/server/internal/api/apiv1/post_init_handlers.go b/server/internal/api/apiv1/post_init_handlers.go
index 831d8294..c7a346a9 100644
--- a/server/internal/api/apiv1/post_init_handlers.go
+++ b/server/internal/api/apiv1/post_init_handlers.go
@@ -152,10 +152,9 @@ func (s *PostInitHandlers) GetCluster(ctx context.Context) (*api.Cluster, error)
 		return nil, apiErr(err)
 	}
 	cluster := &api.Cluster{
-		ID:       api.Identifier(storedCluster.ID),
-		TenantID: api.Identifier(s.cfg.TenantID),
-		Hosts:    apiHosts,
-		Status:   &api.ClusterStatus{State: "available"},
+		ID:     api.Identifier(storedCluster.ID),
+		Hosts:  apiHosts,
+		Status: &api.ClusterStatus{State: "available"},
 	}
 
 	return cluster, nil