diff --git a/superset/config.py b/superset/config.py
index 0234c0deb230b..f0ba25a3eb088 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -68,6 +68,7 @@
 
 if TYPE_CHECKING:
     from flask_appbuilder.security.sqla import models
+    from sqlglot import Dialect, Dialects
 
     from superset.connectors.sqla.models import SqlaTable
     from superset.models.core import Database
@@ -249,6 +250,10 @@ def _try_json_readsha(filepath: str, length: int) -> str | None:
 SQLALCHEMY_ENCRYPTED_FIELD_TYPE_ADAPTER = (  # pylint: disable=invalid-name
     SQLAlchemyUtilsAdapter
 )
+
+# Extends the default SQLGlot dialects with additional dialects
+SQLGLOT_DIALECTS_EXTENSIONS: map[str, Dialects | type[Dialect]] = {}
+
 # The limit of queries fetched for query search
 QUERY_SEARCH_LIMIT = 1000
 
diff --git a/superset/initialization/__init__.py b/superset/initialization/__init__.py
index 10686b872ff41..1720c87af48e2 100644
--- a/superset/initialization/__init__.py
+++ b/superset/initialization/__init__.py
@@ -54,6 +54,7 @@
     talisman,
 )
 from superset.security import SupersetSecurityManager
+from superset.sql.parse import SQLGLOT_DIALECTS
 from superset.superset_typing import FlaskResponse
 from superset.tags.core import register_sqla_event_listeners
 from superset.utils.core import is_test, pessimistic_connection_handling
@@ -484,6 +485,7 @@ def init_app(self) -> None:
         self.configure_middlewares()
         self.configure_cache()
         self.set_db_default_isolation()
+        self.configure_sqlglot_dialects()
 
         with self.superset_app.app_context():
             self.init_app_in_ctx()
@@ -544,6 +546,9 @@ def configure_cache(self) -> None:
     def configure_feature_flags(self) -> None:
         feature_flag_manager.init_app(self.superset_app)
 
+    def configure_sqlglot_dialects(self) -> None:
+        SQLGLOT_DIALECTS.update(self.config["SQLGLOT_DIALECTS_EXTENSIONS"])
+
     @transaction()
     def configure_fab(self) -> None:
         if self.config["SILENCE_FAB"]:
diff --git a/superset/sql_parse.py b/superset/sql_parse.py
index 91b68126356a2..1581b0c6e79e6 100644
--- a/superset/sql_parse.py
+++ b/superset/sql_parse.py
@@ -28,7 +28,6 @@
 from flask_babel import gettext as __
 from jinja2 import nodes
 from sqlalchemy import and_
-from sqlglot.dialects.dialect import Dialects
 from sqlparse import keywords
 from sqlparse.lexer import Lexer
 from sqlparse.sql import (
@@ -61,7 +60,12 @@
     SupersetParseError,
     SupersetSecurityException,
 )
-from superset.sql.parse import extract_tables_from_statement, SQLScript, Table
+from superset.sql.parse import (
+    extract_tables_from_statement,
+    SQLGLOT_DIALECTS,
+    SQLScript,
+    Table,
+)
 from superset.utils.backports import StrEnum
 
 try:
@@ -88,61 +92,6 @@
 lex.set_SQL_REGEX(sqlparser_sql_regex)
 
 
-# mapping between DB engine specs and sqlglot dialects
-SQLGLOT_DIALECTS = {
-    "ascend": Dialects.HIVE,
-    "awsathena": Dialects.PRESTO,
-    "bigquery": Dialects.BIGQUERY,
-    "clickhouse": Dialects.CLICKHOUSE,
-    "clickhousedb": Dialects.CLICKHOUSE,
-    "cockroachdb": Dialects.POSTGRES,
-    "couchbase": Dialects.MYSQL,
-    # "crate": ???
-    # "databend": ???
-    "databricks": Dialects.DATABRICKS,
-    # "db2": ???
-    # "dremio": ???
-    "drill": Dialects.DRILL,
-    # "druid": ???
-    "duckdb": Dialects.DUCKDB,
-    # "dynamodb": ???
-    # "elasticsearch": ???
-    # "exa": ???
-    # "firebird": ???
-    # "firebolt": ???
-    "gsheets": Dialects.SQLITE,
-    "hana": Dialects.POSTGRES,
-    "hive": Dialects.HIVE,
-    # "ibmi": ???
-    # "impala": ???
-    # "kustokql": ???
-    # "kylin": ???
-    "mssql": Dialects.TSQL,
-    "mysql": Dialects.MYSQL,
-    "netezza": Dialects.POSTGRES,
-    # "ocient": ???
-    # "odelasticsearch": ???
-    "oracle": Dialects.ORACLE,
-    # "pinot": ???
-    "postgresql": Dialects.POSTGRES,
-    "presto": Dialects.PRESTO,
-    "pydoris": Dialects.DORIS,
-    "redshift": Dialects.REDSHIFT,
-    # "risingwave": ???
-    # "rockset": ???
-    "shillelagh": Dialects.SQLITE,
-    "snowflake": Dialects.SNOWFLAKE,
-    # "solr": ???
-    "spark": Dialects.SPARK,
-    "sqlite": Dialects.SQLITE,
-    "starrocks": Dialects.STARROCKS,
-    "superset": Dialects.SQLITE,
-    "teradatasql": Dialects.TERADATA,
-    "trino": Dialects.TRINO,
-    "vertica": Dialects.POSTGRES,
-}
-
-
 class CtasMethod(StrEnum):
     TABLE = "TABLE"
     VIEW = "VIEW"
diff --git a/tests/unit_tests/sql/parse_tests.py b/tests/unit_tests/sql/parse_tests.py
index 6c1e5791277b3..ae5ebf89a8b96 100644
--- a/tests/unit_tests/sql/parse_tests.py
+++ b/tests/unit_tests/sql/parse_tests.py
@@ -18,6 +18,7 @@
 
 
 import pytest
+from sqlglot import Dialects
 
 from superset.exceptions import SupersetParseError
 from superset.sql.parse import (
@@ -932,3 +933,15 @@ def test_get_settings() -> None:
 SELECT * FROM some_table;
     """
     assert SQLScript(sql, "postgresql").get_settings() == {"search_path": "bar"}
+
+
+@pytest.mark.parametrize(
+    "app",
+    [{"SQLGLOT_DIALECTS_EXTENSIONS": {"custom": Dialects.MYSQL}}],
+    indirect=True,
+)
+def test_custom_dialect(app: None) -> None:
+    """
+    Test that custom dialects are loaded correctly.
+    """
+    assert SQLGLOT_DIALECTS.get("custom") == Dialects.MYSQL