Bathroom Bashi Mosque (in Turkish: Banyabaşı Camii, Banya Bashi Mosque) is a mosque in Sofia.

It was built on the initiative and with the financial support of the benefactor Molla Efendi Kada Seyfulah.

Therefore, in some sources, the mosque is also known as the Molla Efendi Mosque or as the Cadou Saifullah.

An unbreakable text is written on the arch over the door on a painting stone.

The date 974 is below it, which gives grounds to assume that it was built in 974 by the Hijra (Muslim Chronology) or 1566-1567.