Vann Molyvann (born November 23, 1926) is a Cambodian architect. During the Sangkum Reastr Niyum regime (1955–1970) Prince Norodom Sihanouk enacted a development policy encompassing the whole kingdom with the construction of new towns, infrastructure and architecture. Vann was the foremost of a generation of architects who contributed to the unique style of architecture that emerged during this era and that has been coined New Khmer Architecture.

Born in Ream, Kampot province in 1926, Vann Molyvann obtained a scholarship to pursue his studies in Paris, France. After one year of law, he switched to architecture at the School of Fine Arts in Paris (Ecole Nationale Supérieure des Beaux-Arts). He studied in the Arretche studio and returned in 1956, the first fully qualified Cambodian architect, keen to put his talents to use. He was promptly appointed Head of Public Works and State Architect by Sihanouk.

During this era known as the "Golden Age", Vann built such famous landmarks as Chaktomuk Conference Hall, the Council of Ministers and the State Palace in the capital. He supervised the design and construction of new towns such as Tioulongville (Kirirom) and Sihanoukville (Kompong Som) and important town plans such as the Bassac development in Phnom Penh, where a mix of cultural facilities such as the National Theatre Preah Suramarit and the Exhibition Hall neighboured with large housing experiments. He also designed many of Cambodia's embassies and exhibitions abroad.