The Strossmayer Gallery of Old Masters (Strossmayerova galerija starih majstora) is a fine art museum in Zagreb, Croatia exhibiting the collection donated to the city by Bishop Josip Juraj Strossmayer in 1884.

The Strossmayer Gallery holding includes around 4,000 works, of which some 250 are on display, with the remainder in storage, or on display at other museums or gallery institutions in Croatia.