Sri Lankan Parliament Building, Modern parliament building in Sri Jayawardenepura Kotte, Sri Lanka.

The Parliament Building stands on an artificial island surrounded by Diyawanna Oya waters, displaying modern architecture with clean lines and geometric forms. It houses chambers and offices for 225 members who serve in this unicameral legislative system.

In 1967, under Speaker Sir Albert F. Peris, party leaders agreed to build a new parliament across Beira Lake from the Galle Face building, but no action followed. A later attempt under Speaker Stanley Tillekeratne (1970–77) was also abandoned. On 4 July 1979, Prime Minister Ranasinghe Premadasa obtained sanction to build on Duwa, a 5-hectare island in the Diyawanna Oya. Designed by Geoffrey Bawa and built by a Japanese Mitsui consortium, it opened on 29 April 1982.

The complex is called the New Parliament Complex, and its island setting is Duwa, where minister Nissaka Alakesvara's palace once stood. Geoffrey Bawa's design is regional modernism: a symmetrical plan set against the irregular Diyawanna Oya. The building was opened on 29 April 1982 by President J. R. Jayewardene.

Access to the artificial island is via bridges that are easily walkable, though visitors should understand this is primarily a working place for members. The surroundings offer space for walking and allow viewing the architectural structure from the exterior.

The site was once home to a medieval palace that belonged to a minister of King Vikramabahu III. This hidden historical connection links the modern legislative center to the island's royal past.