Is There a Prayer Room at Yenikapı Station?

First exit the turnstiles as if transferring toward the Marmaray. When you reach the Marmaray turnstile area, you'll see the "MESCİD" (prayer room) sign at the far end (it will probably be on your right). (It stays to the left of the escalators marked "Namık Kemal Cad.")

There is a prayer room but no ablution facilities. Men can perform ablution at the sink, but for women the sink area is open to view from the outside, so it is unfortunately not very suitable for performing ablution.