Molla Ahmad Mosque (Azerbaijani: Molla Əhməd məscidi) or Nasir ad-Din Gashtasib mosque (Azerbaijani: Nəsir ad-Din Gəştasib məscidi) is a historical mosque of the 14th century. It is a part of Old City and located on Sabir street, in the city of Baku, in Azerbaijan. The building was also registered as a national architectural monument by the decision of the Cabinet of Ministers of the Republic of Azerbaijan dated August 2, 2001, No. 132.