The Saidina Abu Bakar As Siddiq Mosque (MSABA) (Malay: Masjid Saidina Abu Bakar As-Siddiq) is a prominent mosque in Bangsar, Kuala Lumpur, Malaysia. The mosque was named after Muhammad's successor (Caliph) Abu Bakr.

In 1976, the people of Bangsar began to request for a mosque. It was approved by the Federal Territory Islamic Religious Council on 25 November 1977. A meeting was held by local representatives with YB Datuk Othman Abdullah on 27 November 1977.The mosque was handed over officially to the government on 29 March 1982. Its official opening ceremony was officiated by the Yang di-Pertuan Agong, Sultan Ahmad Shah ibni Almarhum Sultan Abu Bakar on 15 July 1982.

The architecture is of traditional Malay mosque architecture with a minaret (43.3 m), arches, dome (16.6 m wide and 24 m from the floor), and motifs, but modern in form. It has an open concept, where air flow is allowed into the mosque as the door are made from hard wood. Islamic patterned holes are carved in between the motifs.

Its architectural designs are used in the construction for the Maldives National Mosque, as well as other prominent mosques in Kuala Lumpur such as Masjid Saidina Omar al-Khattab and Masjid Saidina Uthman ibn Affan.