The Rahmi M. Koç Museum is a transportation and industrial history museum in Istanbul, Turkey. It was founded in 1991 by the Turkish businessman Rahmi M. Koç and is housed in a former machine factory. 

The museum is home to a collection of vintage cars, planes, boats, and other vehicles, as well as various industrial artefacts and machinery.

The Rahmi M. Koç Museum's collection includes over 100 vintage cars, including some of the earliest automobiles ever made. 

It also has a collection of planes, boats, and other vehicles, as well as a variety of industrial artefacts and machinery, such as steam engines, generators, and pumps. The museum has several interactive exhibits, including a simulated steam engine room and a working blacksmith's forge.

The Rahmi M. Koç Museum is a popular tourist attraction in Istanbul and a must-see for anyone interested in transportation and industrial history. It is open to the public and offers guided tours in several languages.