diff --git a/stix2/datastore/relational_db/database_backends/mariadb_backend.py b/stix2/datastore/relational_db/database_backends/mariadb_backend.py
new file mode 100644
index 00000000..b29629bf
--- /dev/null
+++ b/stix2/datastore/relational_db/database_backends/mariadb_backend.py
@@ -0,0 +1,83 @@
+import os
+from typing import Any
+
+from sqlalchemy import TIMESTAMP, LargeBinary, Text, VARCHAR
+from sqlalchemy.schema import CreateSchema
+
+from stix2.base import (
+    _DomainObject, _MetaObject, _Observable, _RelationshipObject,
+)
+from stix2.datastore.relational_db.utils import schema_for
+
+from .database_backend_base import DatabaseBackend
+
+
+class MariaDBBackend(DatabaseBackend):
+    default_database_connection_url = \
+        f"mariadbsql://{os.getenv('MARIADB_USER')}:" + \
+        f"{os.getenv('MARIADB_PASSWORD')}@" + \
+        f"{os.getenv('MARIADB_IP_ADDRESS')}:" + \
+        f"{os.getenv('MARIADB_PORT', '3306')}/rdb"
+
+    def __init__(self, database_connection_url=default_database_connection_url, force_recreate=False, **kwargs: Any):
+        super().__init__(database_connection_url, force_recreate=force_recreate, **kwargs)
+
+    # =========================================================================
+    # schema methods
+
+    def _create_schemas(self):
+        with self.database_connection.begin() as trans:
+            trans.execute(CreateSchema("common", if_not_exists=True))
+            trans.execute(CreateSchema("sdo", if_not_exists=True))
+            trans.execute(CreateSchema("sco", if_not_exists=True))
+            trans.execute(CreateSchema("sro", if_not_exists=True))
+
+    @staticmethod
+    def determine_schema_name(stix_object):
+        if isinstance(stix_object, _DomainObject):
+            return "sdo"
+        elif isinstance(stix_object, _Observable):
+            return "sco"
+        elif isinstance(stix_object, _RelationshipObject):
+            return "sro"
+        elif isinstance(stix_object, _MetaObject):
+            return "common"
+
+    @staticmethod
+    def schema_for(stix_class):
+        return schema_for(stix_class)
+
+    @staticmethod
+    def schema_for_core():
+        return "common"
+
+    # =========================================================================
+    # sql type methods (overrides)
+
+    @staticmethod
+    def determine_sql_type_for_key_as_id():  # noqa: F811
+        return VARCHAR(255)
+
+    @staticmethod
+    def determine_sql_type_for_binary_property():  # noqa: F811
+        return MariaDBBackend.determine_sql_type_for_string_property()
+
+    @staticmethod
+    def determine_sql_type_for_hex_property():  # noqa: F811
+        # return LargeBinary
+        return MariaDBBackend.determine_sql_type_for_string_property()
+
+    @staticmethod
+    def determine_sql_type_for_timestamp_property():  # noqa: F811
+        return TIMESTAMP(timezone=True)
+
+    # =========================================================================
+    # Other methods
+
+    @staticmethod
+    def array_allowed():
+        return False
+
+    @staticmethod
+    def create_regex_constraint_expression(column_name, pattern):
+        return f"{column_name} REGEXP {pattern}"
diff --git a/stix2/datastore/relational_db/database_backends/sqlite_backend.py b/stix2/datastore/relational_db/database_backends/sqlite_backend.py
index 545f928b..d14738ec 100644
--- a/stix2/datastore/relational_db/database_backends/sqlite_backend.py
+++ b/stix2/datastore/relational_db/database_backends/sqlite_backend.py
@@ -39,6 +39,18 @@ def determine_sql_type_for_hex_property():  # noqa: F811
         # return LargeBinary
         return SQLiteBackend.determine_sql_type_for_string_property()
 
+    @staticmethod
+    def determine_sql_type_for_reference_property():  # noqa: F811
+        return Text
+
+    @staticmethod
+    def determine_sql_type_for_string_property():  # noqa: F811
+        return Text
+
+    @staticmethod
+    def determine_sql_type_for_key_as_id():  # noqa: F811
+        return Text
+
     @staticmethod
     def determine_sql_type_for_timestamp_property():  # noqa: F811
         return TIMESTAMP(timezone=True)
@@ -49,3 +61,7 @@ def determine_sql_type_for_timestamp_property():  # noqa: F811
     @staticmethod
     def array_allowed():
         return False
+
+    @staticmethod
+    def create_regex_constraint_expression(column_name, pattern):
+        return f"{column_name} ~ {pattern}"
diff --git a/stix2/datastore/relational_db/relational_db_testing.py b/stix2/datastore/relational_db/relational_db_testing.py
index fc5d94d3..adfa5903 100644
--- a/stix2/datastore/relational_db/relational_db_testing.py
+++ b/stix2/datastore/relational_db/relational_db_testing.py
@@ -2,7 +2,9 @@
 
 from database_backends.postgres_backend import PostgresBackend
 from database_backends.sqlite_backend import SQLiteBackend
+from database_backends.mariadb_backend import MariaDBBackend
 import pytz
+import os
 
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
@@ -288,8 +290,10 @@ def test_dictionary():
 
 def main():
     store = RelationalDBStore(
-        PostgresBackend("postgresql://localhost/stix-data-sink", force_recreate=True),
+        MariaDBBackend("mariadb+pymysql://{os.getenv('MARIADB_USER')}:{os.getenv('MARIADB_PASSWORD')}@127.0.0.1:3306/rdb", force_recreate=True),
+        #PostgresBackend("postgresql://localhost/stix-data-sink", force_recreate=True),
         #SQLiteBackend("sqlite:///stix-data-sink.db", force_recreate=True),
+
         True,
         None,
         True,