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diff --git a/superset/db_engine_specs/mongodb.py b/superset/db_engine_specs/mongodb.py
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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""MongoDB engine spec for Superset.
+
+Uses PyMongoSQL (https://github.com/passren/PyMongoSQL) as the SQLAlchemy dialect
+to enable SQL queries on MongoDB collections.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any, Optional
+
+from sqlalchemy import types
+
+from superset.constants import TimeGrain
+from superset.db_engine_specs.base import BaseEngineSpec, DatabaseCategory
+
+
+class MongoDBEngineSpec(BaseEngineSpec):
+    """Engine spec for MongoDB using PyMongoSQL dialect."""
+
+    engine = "mongodb"
+    engine_name = "MongoDB"
+    force_column_alias_quotes = False
+
+    metadata = {
+        "description": ("MongoDB is a document-oriented, operational NoSQL database."),
+        "logo": "mongodb.png",
+        "homepage_url": "https://www.mongodb.com/",
+        "categories": [
+            DatabaseCategory.SEARCH_NOSQL,
+            DatabaseCategory.PROPRIETARY,
+        ],
+        "pypi_packages": ["pymongosql"],
+        "connection_string": (
+            "mongodb://{username}:{password}@{host}:{port}/{database}?mode=superset"
+        ),
+        "parameters": {
+            "username": "Username for MongoDB",
+            "password": "Password for MongoDB",
+            "host": "MongoDB host",
+            "port": "MongoDB port",
+            "database": "Database name",
+        },
+        "drivers": [
+            {
+                "name": "MongoDB Atlas Cloud",
+                "pypi_package": "pymongosql",
+                "connection_string": "mongodb+srv://{username}:{password}@{host}/{database}?mode=superset",
+                "notes": "For MongoDB Atlas cloud service.",
+                "is_recommended": True,
+            },
+            {
+                "name": "MongoDB Cluster",
+                "pypi_package": "pymongosql",
+                "connection_string": "mongodb://{username}:{password}@{host}:{port}/{database}?mode=superset",
+                "is_recommended": False,
+                "notes": ("For self-hosted MongoDB instances."),
+            },
+        ],
+        "notes": "Uses PartiQL for SQL queries. Requires mode=superset parameter.",
+        "docs_url": "https://github.com/passren/PyMongoSQL",
+    }
+
+    _time_grain_expressions = {
+        None: "{col}",
+        TimeGrain.SECOND: "DATETIME(STRFTIME('%Y-%m-%dT%H:%M:%S', {col}))",
+        TimeGrain.MINUTE: "DATETIME(STRFTIME('%Y-%m-%dT%H:%M:00', {col}))",
+        TimeGrain.HOUR: "DATETIME(STRFTIME('%Y-%m-%dT%H:00:00', {col}))",
+        TimeGrain.DAY: "DATETIME({col}, 'start of day')",
+        TimeGrain.WEEK: (
+            "DATETIME({col}, 'start of day', -strftime('%w', {col}) || ' days')"
+        ),
+        TimeGrain.MONTH: "DATETIME({col}, 'start of month')",
+        TimeGrain.QUARTER: (
+            "DATETIME({col}, 'start of month', "
+            "printf('-%d month', (strftime('%m', {col}) - 1) % 3))"
+        ),
+        TimeGrain.YEAR: "DATETIME({col}, 'start of year')",
+        TimeGrain.WEEK_ENDING_SATURDAY: "DATETIME({col}, 'start of day', 'weekday 6')",
+        TimeGrain.WEEK_ENDING_SUNDAY: "DATETIME({col}, 'start of day', 'weekday 0')",
+        TimeGrain.WEEK_STARTING_SUNDAY: (
+            "DATETIME({col}, 'start of day', 'weekday 0', '-7 days')"
+        ),
+        TimeGrain.WEEK_STARTING_MONDAY: (
+            "DATETIME({col}, 'start of day', 'weekday 1', '-7 days')"
+        ),
+    }
+
+    @classmethod
+    def epoch_to_dttm(cls) -> str:
+        return "datetime({col}, 'unixepoch')"
+
+    @classmethod
+    def convert_dttm(
+        cls,
+        target_type: str,
+        dttm: datetime,
+        db_extra: Optional[dict[str, Any]] = None,
+    ) -> Optional[str]:
+        """Convert Python datetime to MongoDB/SQL datetime string."""
+        sqla_type = cls.get_sqla_column_type(target_type)
+
+        if isinstance(
+            sqla_type, (types.String, types.DateTime, types.Date, types.TIMESTAMP)
+        ):
+            # Return ISO format datetime string for MongoDB compatibility
+            return f"""{dttm.isoformat(sep=" ", timespec="seconds")!r}"""
+
+        return None
diff --git a/tests/unit_tests/db_engine_specs/test_mongodb.py b/tests/unit_tests/db_engine_specs/test_mongodb.py
new file mode 100644
index 00000000000..2272fd51610
--- /dev/null
+++ b/tests/unit_tests/db_engine_specs/test_mongodb.py
@@ -0,0 +1,125 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from datetime import datetime
+from typing import Optional
+
+import pytest
+
+from superset.constants import TimeGrain
+from tests.unit_tests.db_engine_specs.utils import assert_convert_dttm
+from tests.unit_tests.fixtures.common import dttm  # noqa: F401
+
+
+@pytest.mark.parametrize(
+    "target_type,expected_result",
+    [
+        ("text", "'2019-01-02 03:04:05'"),
+        ("TEXT", "'2019-01-02 03:04:05'"),
+        ("dateTime", "'2019-01-02 03:04:05'"),
+        ("DateTime", "'2019-01-02 03:04:05'"),
+        ("DATETIME", "'2019-01-02 03:04:05'"),
+        ("string", "'2019-01-02 03:04:05'"),
+        ("String", "'2019-01-02 03:04:05'"),
+        ("STRING", "'2019-01-02 03:04:05'"),
+        ("integer", None),
+        ("number", None),
+        ("unknowntype", None),
+    ],
+)
+def test_convert_dttm(
+    target_type: str,
+    expected_result: Optional[str],
+    dttm: datetime,  # noqa: F811
+) -> None:
+    """Test datetime conversion for various MongoDB column types."""
+    from superset.db_engine_specs.mongodb import (
+        MongoDBEngineSpec as spec,  # noqa: N813
+    )
+
+    assert_convert_dttm(spec, target_type, expected_result, dttm)
+
+
+def test_epoch_to_dttm() -> None:
+    """Test epoch to datetime conversion."""
+    from superset.db_engine_specs.mongodb import (
+        MongoDBEngineSpec as spec,  # noqa: N813
+    )
+
+    # MongoDB engine just passes through the column expression
+    assert spec.epoch_to_dttm() == "datetime({col}, 'unixepoch')"
+
+
+@pytest.mark.parametrize(
+    "grain,expected_expression",
+    [
+        (None, "{col}"),
+        (TimeGrain.SECOND, "DATETIME(STRFTIME('%Y-%m-%dT%H:%M:%S', {col}))"),
+        (TimeGrain.MINUTE, "DATETIME(STRFTIME('%Y-%m-%dT%H:%M:00', {col}))"),
+        (TimeGrain.HOUR, "DATETIME(STRFTIME('%Y-%m-%dT%H:00:00', {col}))"),
+        (TimeGrain.DAY, "DATETIME({col}, 'start of day')"),
+        (
+            TimeGrain.WEEK,
+            "DATETIME({col}, 'start of day', -strftime('%w', {col}) || ' days')",
+        ),
+        (TimeGrain.MONTH, "DATETIME({col}, 'start of month')"),
+        (
+            TimeGrain.QUARTER,
+            "DATETIME({col}, 'start of month', "
+            "printf('-%d month', (strftime('%m', {col}) - 1) % 3))",
+        ),
+        (TimeGrain.YEAR, "DATETIME({col}, 'start of year')"),
+        (
+            TimeGrain.WEEK_ENDING_SATURDAY,
+            "DATETIME({col}, 'start of day', 'weekday 6')",
+        ),
+        (
+            TimeGrain.WEEK_ENDING_SUNDAY,
+            "DATETIME({col}, 'start of day', 'weekday 0')",
+        ),
+        (
+            TimeGrain.WEEK_STARTING_SUNDAY,
+            "DATETIME({col}, 'start of day', 'weekday 0', '-7 days')",
+        ),
+        (
+            TimeGrain.WEEK_STARTING_MONDAY,
+            "DATETIME({col}, 'start of day', 'weekday 1', '-7 days')",
+        ),
+    ],
+)
+def test_time_grain_expressions(
+    grain: Optional[TimeGrain],
+    expected_expression: str,
+) -> None:
+    """Test time grain expressions for MongoDB."""
+    from superset.db_engine_specs.mongodb import (
+        MongoDBEngineSpec as spec,  # noqa: N813
+    )
+
+    # pylint: disable=protected-access
+    actual = spec._time_grain_expressions.get(grain)
+    assert actual == expected_expression
+
+
+def test_engine_metadata() -> None:
+    """Test MongoDB engine specification metadata."""
+    from superset.db_engine_specs.mongodb import (
+        MongoDBEngineSpec as spec,  # noqa: N813
+    )
+
+    assert spec.engine == "mongodb"
+    assert spec.engine_name == "MongoDB"
+    assert spec.force_column_alias_quotes is False