The Martyn Brothers House (Russian: Дом братьев Мартын), also known as the Red Cottage (Russian: Красный домик), is a building in Rostov-on-Don, located at the intersection of Bolshaya Sadovaya Street and Fortress Lane.

The building was built by architect Nikolai Sokolov [ru] in 1893, in the centre of the former Fortress of Saint Dimitry of Rostov.

The two-storey red brick house was built in 1893 to the design of Rostov architect Nikolai Matveyevich Sokolov [ru].

After the Great Patriotic War, the building was renovated, during which time the roof windows were lost.

[5] Its first exhibition was "Traces of Cossack Antiquity", displaying artefacts from the Hermitage Museum's collections.