The Art Pavilion in Zagreb (Croatian: Umjetnički paviljon u Zagrebu) is an art gallery in Zagreb, Croatia. The Pavilion is located on the Lenuci Horseshoe, Lower Town area of the city, south of Nikola Šubić Zrinski Square, on the northern side of the King Tomislav Square which flanks the Zagreb Central Station. Established in 1898, it is the oldest gallery in the Southeast Europe and the only purpose-built gallery in Zagreb designed specifically to accommodate large-scale exhibitions.

The idea of creating the gallery was first put forward by Croatian painter Vlaho Bukovac in the spring of 1895. In May 1896 a Millennium Exhibition was to be held in Budapest, celebrating 1,000 years of Hungarian statehood, and artists from what was then Kingdom of Croatia-Slavonia were invited to attend. Urged by Bukovac, Croatian artists decided to present their works in a purpose-built Pavilion, constructed around a prefabricated iron skeleton so that it could easily be shipped to Zagreb after the exhibition. The Budapest Pavilion was designed by Hungarian architects Flóris Korb and Kálmán Giergl and was constructed by the Danubius building company.