The Thailand Open was a professional tennis tournament played on indoor hard courts. It was part of the ATP World Tour 250 series of the ATP Tour. It was held annually in Bangkok, Thailand, in the third week of September, since 2003.

From 2005 to 2007, a WTA Tier III, the PTT Bangkok Open, was also held in the region before being discontinued.

Roger Federer is the only man to have won the singles competition more than once, in 2004 and 2005, while Andy Ram and Jonathan Erlich are the only doubles pair to have won the competition multiple times, in 2003 and 2006. In 2007, Sonchat Ratiwatana and Sanchai Ratiwatana became the first Thai champions of the event, winning in the final against Wimbledon doubles champion Michaël Llodra, and partner Nicolas Mahut. In November 2013 the ATP announced that the tournament would be relocated to Shenzhen, China.^[1]

• Thailand Open (Pattaya) – women's tournament