diff --git a/app/dao/organisation_dao.py b/app/dao/organisation_dao.py
index 8c2ef63ddd..06ed25958d 100644
--- a/app/dao/organisation_dao.py
+++ b/app/dao/organisation_dao.py
@@ -2,7 +2,14 @@
 
 from app import db
 from app.dao.dao_utils import transactional, version_class
-from app.models import Domain, InvitedOrganisationUser, Organisation, Service, User
+from app.models import (
+    Domain,
+    EmailBranding,
+    InvitedOrganisationUser,
+    Organisation,
+    Service,
+    User,
+)
 
 
 def dao_get_organisations():
@@ -55,6 +62,10 @@ def dao_update_organisation(organisation_id, **kwargs):
     domains = kwargs.pop("domains", None)
 
     num_updated = Organisation.query.filter_by(id=organisation_id).update(kwargs)
+    if "email_branding_id" in kwargs:
+        email_brand = EmailBranding.query.filter_by(id=kwargs["email_branding_id"]).one()
+        org = Organisation.query.get(organisation_id)
+        org.email_branding = email_brand
 
     if isinstance(domains, list):
         Domain.query.filter_by(organisation_id=organisation_id).delete()
diff --git a/app/models.py b/app/models.py
index 704ccf798a..81767406a1 100644
--- a/app/models.py
+++ b/app/models.py
@@ -276,6 +276,10 @@ class EmailBranding(BaseModel):
         nullable=False,
         default=BRANDING_ORG_NEW,
     )
+    organisation_id = db.Column(
+        UUID(as_uuid=True), db.ForeignKey("organisation.id", ondelete="SET NULL"), index=True, nullable=True
+    )
+    organisation = db.relationship("Organisation", back_populates="email_branding", foreign_keys=[organisation_id])
 
     def serialize(self) -> dict:
         serialized = {
@@ -285,6 +289,7 @@ def serialize(self) -> dict:
             "name": self.name,
             "text": self.text,
             "brand_type": self.brand_type,
+            "organisation_id": str(self.organisation_id) if self.organisation_id else "",
         }
 
         return serialized
@@ -449,10 +454,9 @@ class Organisation(BaseModel):
         "Domain",
     )
 
-    email_branding = db.relationship("EmailBranding")
+    email_branding = db.relationship("EmailBranding", uselist=False)
     email_branding_id = db.Column(
         UUID(as_uuid=True),
-        db.ForeignKey("email_branding.id"),
         nullable=True,
     )
 
diff --git a/migrations/versions/0445_add_org_id_branding.py b/migrations/versions/0445_add_org_id_branding.py
new file mode 100644
index 0000000000..0504d5f492
--- /dev/null
+++ b/migrations/versions/0445_add_org_id_branding.py
@@ -0,0 +1,46 @@
+"""
+Revision ID: 0445_add_org_id_branding
+Revises: 0444_add_index_n_history2.py
+Create Date: 2024-02-27
+"""
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision = "0445_add_org_id_branding"
+down_revision = "0444_add_index_n_history2"
+
+
+def upgrade():
+    op.add_column(
+        "email_branding",
+        sa.Column("organisation_id", postgresql.UUID(as_uuid=True), nullable=True),
+    )
+    op.create_index(
+        op.f("ix_email_branding_organisation_id"),
+        "email_branding",
+        ["organisation_id"],
+        unique=False,
+    )
+    op.create_foreign_key(
+        "fk_email_branding_organisation",
+        "email_branding",
+        "organisation",
+        ["organisation_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+    op.drop_constraint("fk_organisation_email_branding_id", "organisation", type_="foreignkey")
+
+
+def downgrade():
+    op.drop_index(op.f("ix_email_branding_organisation_id"), table_name="email_branding")
+    op.drop_constraint("fk_email_branding_organisation", "email_branding", type_="foreignkey")
+    op.drop_column("email_branding", "organisation_id")
+    op.create_foreign_key(
+        "fk_organisation_email_branding_id",
+        "organisation",
+        "email_branding",
+        ["email_branding_id"],
+        ["id"],
+    )
diff --git a/tests/app/email_branding/test_rest.py b/tests/app/email_branding/test_rest.py
index c09218d62d..9d7bd1f6f7 100644
--- a/tests/app/email_branding/test_rest.py
+++ b/tests/app/email_branding/test_rest.py
@@ -4,8 +4,8 @@
 from tests.app.db import create_email_branding
 
 
-def test_get_email_branding_options(admin_request, notify_db, notify_db_session):
-    email_branding1 = EmailBranding(colour="#FFFFFF", logo="/path/image.png", name="Org1")
+def test_get_email_branding_options(admin_request, notify_db, notify_db_session, sample_organisation):
+    email_branding1 = EmailBranding(colour="#FFFFFF", logo="/path/image.png", name="Org1", organisation_id=sample_organisation.id)
     email_branding2 = EmailBranding(colour="#000000", logo="/path/other.png", name="Org2")
     notify_db.session.add_all([email_branding1, email_branding2])
     notify_db.session.commit()
@@ -17,6 +17,8 @@ def test_get_email_branding_options(admin_request, notify_db, notify_db_session)
         str(email_branding1.id),
         str(email_branding2.id),
     }
+    assert email_branding[0]["organisation_id"] == str(sample_organisation.id)
+    assert email_branding[1]["organisation_id"] == ""
 
 
 def test_get_email_branding_by_id(admin_request, notify_db, notify_db_session):
@@ -37,6 +39,7 @@ def test_get_email_branding_by_id(admin_request, notify_db, notify_db_session):
         "id",
         "text",
         "brand_type",
+        "organisation_id",
     }
     assert response["email_branding"]["colour"] == "#FFFFFF"
     assert response["email_branding"]["logo"] == "/path/image.png"