The Ōita Prefectural Art Museum (大分県立美術館, Ōitakenritsu Bijutsukan), also known informally as OpAm, is an art museum and community exhibition venue in Ōita Prefecture, Japan.

The museum is located in the center of the prefectural capital Ōita-shi, a 15-minute walk north-west of Ōita Station.

The building was designed by Pritzker Architecture Prize winning architect Shigeru Ban.

[1] At the ground level the building features fully retractable glass shutters opening the main internal exhibition space onto an adjacent public plaza.

[2] The museum houses over 5,000 pieces in its permanent collection, focusing on artists connected with Oita.