diff --git a/app/controllers/institutions_controller.rb b/app/controllers/institutions_controller.rb
index 7170bed0..13ac6c2f 100644
--- a/app/controllers/institutions_controller.rb
+++ b/app/controllers/institutions_controller.rb
@@ -953,6 +953,7 @@ def settings_params
                                         :saml_idp_sso_post_service_url,
                                         :saml_idp_sso_redirect_service_url,
                                         :saml_last_name_attribute,
+                                        :saml_sp_entity_id,
                                         :saml_sp_next_public_cert,
                                         :saml_sp_private_key,
                                         :saml_sp_public_cert,
diff --git a/app/models/institution.rb b/app/models/institution.rb
index 5aa9b416..9a2b1ec5 100644
--- a/app/models/institution.rb
+++ b/app/models/institution.rb
@@ -124,6 +124,7 @@
 # * `saml_metadata_url`                 Caches the value entered into the URL
 #                                       field when supplying SAML metadata from
 #                                       A URL.
+# * `saml_sp_entity_id`                 SAML SP entity ID.
 # * `saml_sp_next_public_cert`          SAML X.509 public certificate with a
 #                                       later expiration than
 #                                       {saml_sp_public_cert} to facilitate
@@ -463,6 +464,13 @@ def default_metadata_profile
     self.metadata_profiles.where(institution_default: true).limit(1).first
   end
 
+  ##
+  # @return [String]
+  #
+  def default_saml_sp_entity_id
+    [scope_url, "entity"].join("/")
+  end
+
   ##
   # @return [SubmissionProfile]
   #
@@ -709,7 +717,7 @@ def required_elements
   # @return [String]
   #
   def saml_sp_entity_id
-    [scope_url, "entity"].join("/")
+    read_attribute(:saml_sp_entity_id) || default_saml_sp_entity_id
   end
 
   ##
diff --git a/app/views/institutions/_saml_authentication_form.html.haml b/app/views/institutions/_saml_authentication_form.html.haml
index d6850e91..0d153f57 100644
--- a/app/views/institutions/_saml_authentication_form.html.haml
+++ b/app/views/institutions/_saml_authentication_form.html.haml
@@ -36,6 +36,9 @@
   .row
     .col-lg-6
       %h5 Service Provider
+      .mb-3
+        = f.label :saml_sp_entity_id, "Entity ID"
+        = f.text_field :saml_sp_entity_id, class: "form-control"
       .mb-3
         = f.label :saml_sp_private_key, "Private Key"
         = f.text_area :saml_sp_private_key, rows: 10, class: "form-control"
diff --git a/db/migrate/20240119023719_add_institutions_saml_sp_entity_id_column.rb b/db/migrate/20240119023719_add_institutions_saml_sp_entity_id_column.rb
new file mode 100644
index 00000000..0cc590d4
--- /dev/null
+++ b/db/migrate/20240119023719_add_institutions_saml_sp_entity_id_column.rb
@@ -0,0 +1,5 @@
+class AddInstitutionsSamlSpEntityIdColumn < ActiveRecord::Migration[7.1]
+  def change
+    add_column :institutions, :saml_sp_entity_id, :string
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 6ff605ac..f5dc8673 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_12_12_202706) do
+ActiveRecord::Schema[7.1].define(version: 2024_01_19_023719) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
   enable_extension "unaccent"
@@ -448,6 +448,7 @@
     t.string "saml_idp_sso_redirect_service_url"
     t.boolean "allow_user_registration", default: true, null: false
     t.string "saml_metadata_url"
+    t.string "saml_sp_entity_id"
     t.index ["fqdn"], name: "index_institutions_on_fqdn", unique: true
     t.index ["incoming_message_queue"], name: "index_institutions_on_incoming_message_queue", unique: true
     t.index ["key"], name: "index_institutions_on_key", unique: true
diff --git a/test/models/institution_test.rb b/test/models/institution_test.rb
index 1da7c515..76895a7d 100644
--- a/test/models/institution_test.rb
+++ b/test/models/institution_test.rb
@@ -301,6 +301,12 @@ class InstitutionTest < ActiveSupport::TestCase
     assert @instance.default_metadata_profile.institution_default
   end
 
+  # default_saml_sp_entity_id()
+
+  test "default_saml_sp_entity_id() returns a correct value" do
+    assert_equal "#{@instance.scope_url}/entity", @instance.default_saml_sp_entity_id
+  end
+
   # default_submission_profile()
 
   test "default_submission_profile() returns the default submission profile" do
@@ -981,8 +987,9 @@ class InstitutionTest < ActiveSupport::TestCase
 
   # saml_sp_entity_id()
 
-  test "saml_sp_entity_id() returns a correct value" do
-    assert_equal "#{@instance.scope_url}/entity", @instance.saml_sp_entity_id
+  test "saml_sp_entity_id() returns the default entity ID when not set" do
+    assert_equal @instance.default_saml_sp_entity_id,
+                 @instance.saml_sp_entity_id
   end
 
   # saml_sp_next_public_cert