Millenaris budapest, Event venue and park in Budapest, Hungary

Millenaris is an event venue and park that combines modern exhibition halls with landscaped gardens in central Budapest. The complex features multiple specialized spaces for large gatherings, conferences, and shows, all integrated into a single venue.

The park occupies the site of the Ganz Works electrical factory, founded as a foundry by Abraham Ganz in 1844 and developed by András Mechwart, who set up its electricity department in 1878. The Lövőház Street factory of 1897 employed over two thousand people, and the 1911–12 assembly hall is now a protected industrial monument. Production declined after 1991, and demolition of unneeded sections began in August 2000; the park opened in 2001.

The park's name refers to the 1896 millennium of the Hungarian conquest, though the site opened in 2001. The preserved Great Hall (Building B), a listed industrial monument from 1911–12, now houses exhibitions, while Assembly Hall E became the National Dance Theatre. Pieces of machinery from the former Ganz Works foundry remain on display in the park.

The park lies in Budapest's 2nd district, bordered by Lövőház Street, Margit körút, Kisrókus Street and Marczibányi Square. The main entrance is on Lövőház Street at Reception Building G, which handles visitor services and catering. An underground car park sits beneath the park, and the retained halls are linked by the new entrance Building C.

The park's name refers to the 1896 millennium celebrations, but the site itself opened in 2001. Demolition of unneeded factory sections began on 12 August 2000; two 37 m high, 126 m long industrial buildings and a chimney were torn down, producing about 120,000 cubic metres of debris.