diff --git a/coderd/database/dbauthz/dbauthz.go b/coderd/database/dbauthz/dbauthz.go
index a0da90eb52f23..a6c6b34f2dafa 100644
--- a/coderd/database/dbauthz/dbauthz.go
+++ b/coderd/database/dbauthz/dbauthz.go
@@ -1016,6 +1016,12 @@ func (q *querier) GetDERPMeshKey(ctx context.Context) (string, error) {
 	return q.db.GetDERPMeshKey(ctx)
 }
 
+func (q *querier) GetDefaultOrganization(ctx context.Context) (database.Organization, error) {
+	return fetch(q.log, q.auth, func(ctx context.Context, _ any) (database.Organization, error) {
+		return q.db.GetDefaultOrganization(ctx)
+	})(ctx, nil)
+}
+
 func (q *querier) GetDefaultProxyConfig(ctx context.Context) (database.GetDefaultProxyConfigRow, error) {
 	// No authz checks
 	return q.db.GetDefaultProxyConfig(ctx)
diff --git a/coderd/database/dbauthz/dbauthz_test.go b/coderd/database/dbauthz/dbauthz_test.go
index 56b6012ba2193..c55b55a3d164d 100644
--- a/coderd/database/dbauthz/dbauthz_test.go
+++ b/coderd/database/dbauthz/dbauthz_test.go
@@ -570,6 +570,10 @@ func (s *MethodTestSuite) TestOrganization() {
 		o := dbgen.Organization(s.T(), db, database.Organization{})
 		check.Args(o.ID).Asserts(o, rbac.ActionRead).Returns(o)
 	}))
+	s.Run("GetDefaultOrganization", s.Subtest(func(db database.Store, check *expects) {
+		o := dbgen.Organization(s.T(), db, database.Organization{})
+		check.Args().Asserts(o, rbac.ActionRead).Returns(o)
+	}))
 	s.Run("GetOrganizationByName", s.Subtest(func(db database.Store, check *expects) {
 		o := dbgen.Organization(s.T(), db, database.Organization{})
 		check.Args(o.Name).Asserts(o, rbac.ActionRead).Returns(o)
diff --git a/coderd/database/dbmem/dbmem.go b/coderd/database/dbmem/dbmem.go
index 6f7dba0999b92..ae0a0d7e48d33 100644
--- a/coderd/database/dbmem/dbmem.go
+++ b/coderd/database/dbmem/dbmem.go
@@ -1657,6 +1657,18 @@ func (q *FakeQuerier) GetDERPMeshKey(_ context.Context) (string, error) {
 	return q.derpMeshKey, nil
 }
 
+func (q *FakeQuerier) GetDefaultOrganization(_ context.Context) (database.Organization, error) {
+	q.mutex.RLock()
+	defer q.mutex.RUnlock()
+
+	for _, org := range q.organizations {
+		if org.IsDefault {
+			return org, nil
+		}
+	}
+	return database.Organization{}, sql.ErrNoRows
+}
+
 func (q *FakeQuerier) GetDefaultProxyConfig(_ context.Context) (database.GetDefaultProxyConfigRow, error) {
 	return database.GetDefaultProxyConfigRow{
 		DisplayName: q.defaultProxyDisplayName,
diff --git a/coderd/database/dbmetrics/dbmetrics.go b/coderd/database/dbmetrics/dbmetrics.go
index 948de3c763277..b07b7b0305d9c 100644
--- a/coderd/database/dbmetrics/dbmetrics.go
+++ b/coderd/database/dbmetrics/dbmetrics.go
@@ -433,6 +433,13 @@ func (m metricsStore) GetDERPMeshKey(ctx context.Context) (string, error) {
 	return key, err
 }
 
+func (m metricsStore) GetDefaultOrganization(ctx context.Context) (database.Organization, error) {
+	start := time.Now()
+	r0, r1 := m.s.GetDefaultOrganization(ctx)
+	m.queryLatencies.WithLabelValues("GetDefaultOrganization").Observe(time.Since(start).Seconds())
+	return r0, r1
+}
+
 func (m metricsStore) GetDefaultProxyConfig(ctx context.Context) (database.GetDefaultProxyConfigRow, error) {
 	start := time.Now()
 	resp, err := m.s.GetDefaultProxyConfig(ctx)
diff --git a/coderd/database/dbmock/dbmock.go b/coderd/database/dbmock/dbmock.go
index d767fd7cf5bd7..cbe91468c2a6d 100644
--- a/coderd/database/dbmock/dbmock.go
+++ b/coderd/database/dbmock/dbmock.go
@@ -828,6 +828,21 @@ func (mr *MockStoreMockRecorder) GetDERPMeshKey(arg0 any) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetDERPMeshKey", reflect.TypeOf((*MockStore)(nil).GetDERPMeshKey), arg0)
 }
 
+// GetDefaultOrganization mocks base method.
+func (m *MockStore) GetDefaultOrganization(arg0 context.Context) (database.Organization, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetDefaultOrganization", arg0)
+	ret0, _ := ret[0].(database.Organization)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetDefaultOrganization indicates an expected call of GetDefaultOrganization.
+func (mr *MockStoreMockRecorder) GetDefaultOrganization(arg0 any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetDefaultOrganization", reflect.TypeOf((*MockStore)(nil).GetDefaultOrganization), arg0)
+}
+
 // GetDefaultProxyConfig mocks base method.
 func (m *MockStore) GetDefaultProxyConfig(arg0 context.Context) (database.GetDefaultProxyConfigRow, error) {
 	m.ctrl.T.Helper()
diff --git a/coderd/database/querier.go b/coderd/database/querier.go
index cbeb5b1caf746..4b459e3141216 100644
--- a/coderd/database/querier.go
+++ b/coderd/database/querier.go
@@ -102,6 +102,7 @@ type sqlcQuerier interface {
 	GetAuthorizationUserRoles(ctx context.Context, userID uuid.UUID) (GetAuthorizationUserRolesRow, error)
 	GetDBCryptKeys(ctx context.Context) ([]DBCryptKey, error)
 	GetDERPMeshKey(ctx context.Context) (string, error)
+	GetDefaultOrganization(ctx context.Context) (Organization, error)
 	GetDefaultProxyConfig(ctx context.Context) (GetDefaultProxyConfigRow, error)
 	GetDeploymentDAUs(ctx context.Context, tzOffset int32) ([]GetDeploymentDAUsRow, error)
 	GetDeploymentID(ctx context.Context) (string, error)
diff --git a/coderd/database/queries.sql.go b/coderd/database/queries.sql.go
index 28d0a34f5ea80..002da316cbccf 100644
--- a/coderd/database/queries.sql.go
+++ b/coderd/database/queries.sql.go
@@ -3142,6 +3142,31 @@ func (q *sqlQuerier) UpdateMemberRoles(ctx context.Context, arg UpdateMemberRole
 	return i, err
 }
 
+const getDefaultOrganization = `-- name: GetDefaultOrganization :one
+SELECT
+	id, name, description, created_at, updated_at, is_default
+FROM
+	organizations
+WHERE
+	is_default = true
+LIMIT
+	1
+`
+
+func (q *sqlQuerier) GetDefaultOrganization(ctx context.Context) (Organization, error) {
+	row := q.db.QueryRowContext(ctx, getDefaultOrganization)
+	var i Organization
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Description,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.IsDefault,
+	)
+	return i, err
+}
+
 const getOrganizationByID = `-- name: GetOrganizationByID :one
 SELECT
 	id, name, description, created_at, updated_at, is_default
diff --git a/coderd/database/queries/organizations.sql b/coderd/database/queries/organizations.sql
index 05185e9c90dec..7f901b003bf44 100644
--- a/coderd/database/queries/organizations.sql
+++ b/coderd/database/queries/organizations.sql
@@ -1,3 +1,13 @@
+-- name: GetDefaultOrganization :one
+SELECT
+	*
+FROM
+	organizations
+WHERE
+	is_default = true
+LIMIT
+	1;
+
 -- name: GetOrganizations :many
 SELECT
 	*
diff --git a/coderd/users.go b/coderd/users.go
index ca757ed80436f..ba6587ecac5fc 100644
--- a/coderd/users.go
+++ b/coderd/users.go
@@ -401,10 +401,18 @@ func (api *API) postUser(rw http.ResponseWriter, r *http.Request) {
 			return
 		}
 	} else {
-		// If no organization is provided, add the user to the first
-		// organization.
-		organizations, err := api.Database.GetOrganizations(ctx)
+		// If no organization is provided, add the user to the default
+		defaultOrg, err := api.Database.GetDefaultOrganization(ctx)
 		if err != nil {
+			if httpapi.Is404Error(err) {
+				httpapi.Write(ctx, rw, http.StatusNotFound,
+					codersdk.Response{
+						Message: "Resource not found or you do not have access to this resource",
+						Detail:  "Organization not found",
+					},
+				)
+				return
+			}
 			httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
 				Message: "Internal error fetching orgs.",
 				Detail:  err.Error(),
@@ -412,12 +420,7 @@ func (api *API) postUser(rw http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		if len(organizations) > 0 {
-			// Add the user to the first organization. Once multi-organization
-			// support is added, we should enable a configuration map of user
-			// email to organization.
-			req.OrganizationID = organizations[0].ID
-		}
+		req.OrganizationID = defaultOrg.ID
 	}
 
 	var loginType database.LoginType
diff --git a/coderd/users_test.go b/coderd/users_test.go
index a9b4fa8de72b3..0d7f5a7bb21b9 100644
--- a/coderd/users_test.go
+++ b/coderd/users_test.go
@@ -493,21 +493,26 @@ func TestPostUsers(t *testing.T) {
 		t.Parallel()
 		auditor := audit.NewMock()
 		client := coderdtest.New(t, &coderdtest.Options{Auditor: auditor})
-		numLogs := len(auditor.AuditLogs())
-
 		firstUser := coderdtest.CreateFirstUser(t, client)
-		numLogs++ // add an audit log for user create
-		numLogs++ // add an audit log for login
 
 		ctx, cancel := context.WithTimeout(context.Background(), testutil.WaitLong)
 		defer cancel()
 
+		// Add an extra org to try and confuse user creation
+		_, err := client.CreateOrganization(ctx, codersdk.CreateOrganizationRequest{
+			Name: "foobar",
+		})
+		require.NoError(t, err)
+
+		numLogs := len(auditor.AuditLogs())
+
 		user, err := client.CreateUser(ctx, codersdk.CreateUserRequest{
 			Email:    "another@user.org",
 			Username: "someone-else",
 			Password: "SomeSecurePassword!",
 		})
 		require.NoError(t, err)
+		numLogs++ // add an audit log for user create
 
 		require.Len(t, auditor.AuditLogs(), numLogs)
 		require.Equal(t, database.AuditActionCreate, auditor.AuditLogs()[numLogs-1].Action)