The Rahmi M. Koç Museum is a private industrial museum in Istanbul, Turkey dedicated to history of transport, industry and communications. Rahmi M. Koç, member of the wealthiest dynasty in Turkey and retired boss of the Koç Group, founded the museum in 1991, which was opened on December 13, 1994. The museum is located in the suburb of Hasköy on the north shore of the Golden Horn and situated in two historical buildings connected to each other. It is open to public every day except Monday. The museum's general manager is Ertuğrul Duru. A sister museum, but smaller in size, the Çengelhan Rahmi M. Koç Museum opened its doors to the residents of Ankara in 2005.