The Royal Flora Ratchaphruek was an international horticultural exposition held 1 November, 2006 to 31 January, 2007 at Mae Hia, Chiang Mai Province, Thailand that drew 3,781,624 visitors.

Recognised by the Bureau International des Expositions (BIE), it was one of the grand celebrations hosted by the Royal Thai Government in honor of King Bhumibol, the world's longest reigning monarch.

The ratchaphruek (Cassia fistula), or golden shower tree, is the de facto national flower of Thailand.

The event was located on 80 hectares of land at the Royal Agricultural Research Center in the Mae Hia sub-district, Mueang district, Chiang Mai Province in northern Thailand.

Despite some complaints of corruption and substandard facilities, organizers believed the exposition achieved its goals of promoting tourism and developing Thai horticultural industries.