Sultan Mahmut Fountain (Turkish: Sultan Mahmut Çeşmesi) is a historical public fountain in Istanbul, Turkey.

The fountain is located in Kireçburnu neighborhood of Sarıyer secondary municipality by Bosphorous.

It was commissioned by Ottoman sultan Mahmut II (reigned 1808–1839) in 1814.

Its ornamental slab as well as the inscription is made of marble.

The inscription was written by Yesarizade Mustafa Izzet Efendi.