diff --git a/pkg/migration/20191207204427.go b/pkg/migration/20191207204427.go
new file mode 100644
index 000000000..e19187b96
--- /dev/null
+++ b/pkg/migration/20191207204427.go
@@ -0,0 +1,44 @@
+// Copyright 2019 Vikunja and contriubtors. All rights reserved.
+//
+// This file is part of Vikunja.
+//
+// Vikunja is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Vikunja is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Vikunja.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"github.com/go-xorm/xorm"
+	"src.techknowlogick.com/xormigrate"
+)
+
+type list20191207204427 struct {
+	Identifier string `xorm:"varchar(10) null" json:"identifier"`
+}
+
+func (list20191207204427) TableName() string {
+	return "list"
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20191207204427",
+		Description: "Add task identifier to list",
+		Migrate: func(tx *xorm.Engine) error {
+			return tx.Sync2(list20191207204427{})
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return tx.DropTables(list20191207204427{})
+		},
+	})
+}
diff --git a/pkg/models/error.go b/pkg/models/error.go
index 0af2b978b..0acb6cbb0 100644
--- a/pkg/models/error.go
+++ b/pkg/models/error.go
@@ -471,6 +471,29 @@ func (err ErrListShareDoesNotExist) HTTPError() web.HTTPError {
 	return web.HTTPError{HTTPCode: http.StatusNotFound, Code: ErrCodeListShareDoesNotExist, Message: "The list share does not exist."}
 }
 
+// ErrListIdentifierIsNotUnique represents a "ErrListIdentifierIsNotUnique" kind of error. Used if the provided list identifier is not unique.
+type ErrListIdentifierIsNotUnique struct {
+	Identifier string
+}
+
+// IsErrListIdentifierIsNotUnique checks if an error is a ErrListIdentifierIsNotUnique.
+func IsErrListIdentifierIsNotUnique(err error) bool {
+	_, ok := err.(ErrListIdentifierIsNotUnique)
+	return ok
+}
+
+func (err ErrListIdentifierIsNotUnique) Error() string {
+	return fmt.Sprintf("List identifier is not unique.")
+}
+
+// ErrCodeListIdentifierIsNotUnique holds the unique world-error code of this error
+const ErrCodeListIdentifierIsNotUnique = 3007
+
+// HTTPError holds the http error description
+func (err ErrListIdentifierIsNotUnique) HTTPError() web.HTTPError {
+	return web.HTTPError{HTTPCode: http.StatusNotFound, Code: ErrCodeListIdentifierIsNotUnique, Message: "There already exists a list with this identifier."}
+}
+
 // ================
 // List task errors
 // ================
diff --git a/pkg/models/fixtures/list.yml b/pkg/models/fixtures/list.yml
index a86aa6084..209fe515d 100644
--- a/pkg/models/fixtures/list.yml
+++ b/pkg/models/fixtures/list.yml
@@ -2,6 +2,7 @@
   id: 1
   title: Test1
   description: Lorem Ipsum
+  identifier: test
   owner_id: 1
   namespace_id: 1
   updated: 0
diff --git a/pkg/models/list.go b/pkg/models/list.go
index 8ffd1a07c..901865f2e 100644
--- a/pkg/models/list.go
+++ b/pkg/models/list.go
@@ -268,6 +268,17 @@ func CreateOrUpdateList(list *List) (err error) {
 		}
 	}
 
+	// Check if the identifier is unique and not empty
+	if list.Identifier != "" {
+		exists, err := x.Where("identifier = ?", list.Identifier).Exist(&List{})
+		if err != nil {
+			return err
+		}
+		if exists {
+			return ErrListIdentifierIsNotUnique{Identifier: list.Identifier}
+		}
+	}
+
 	if list.ID == 0 {
 		_, err = x.Insert(list)
 		metrics.UpdateCount(1, metrics.ListCountKey)