diff --git a/prisma/migrations/20260819223047_add_organization_ownership/migration.sql b/prisma/migrations/20260819223047_add_organization_ownership/migration.sql
new file mode 100644
index 0000000..23804c1
--- /dev/null
+++ b/prisma/migrations/20260819223047_add_organization_ownership/migration.sql
@@ -0,0 +1,14 @@
+/*
+  Warnings:
+
+  - Added the required column `ownerId` to the `organizations` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE "organizations" ADD COLUMN     "ownerId" TEXT NOT NULL;
+
+-- CreateIndex
+CREATE INDEX "organizations_ownerId_idx" ON "organizations"("ownerId");
+
+-- AddForeignKey
+ALTER TABLE "organizations" ADD CONSTRAINT "organizations_ownerId_fkey" FOREIGN KEY ("ownerId") REFERENCES "users"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index d12f7aa..6b2b374 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -18,6 +18,7 @@ model User {
   assignedIncidents       Incident[]
   memberships             Membership[]
   invitationsSent         Invitation[]
+  ownedOrganizations      Organization[]           @relation("OrganizationOwner")
 
   @@map("users")
 }
@@ -268,11 +269,14 @@ model ProtocolHealthAlert {
 model Organization {
   id        String   @id @default(cuid())
   name      String
+  ownerId   String
   createdAt DateTime @default(now())
 
+  owner       User         @relation("OrganizationOwner", fields: [ownerId], references: [id])
   memberships Membership[]
   invitations Invitation[]
 
+  @@index([ownerId])
   @@map("organizations")
 }