The Port of Haydarpaşa, also known as the Port of Haidar Pasha is a general cargo seaport, ro-ro and container terminal, situated in Haydarpaşa, Istanbul, Turkey at the southern entrance to the Bosphorus.

The port is operated by the Turkish State Railways (TCDD) and serves a hinterland which includes the country's most industrialized areas.

It is the second-biggest port in the Marmara Region and with an annual cargo volume exceeding six million metric tons (MT), is Turkey's fourth-biggest port after Mersin, Ambarli and Izmir.