Danai Udomchoke (Thai: ดนัย อุดมโชค, born 11 August 1981) is a former professional tennis player from Thailand.

Udomchoke made his debut in the main draw of a Grand Slam in 2004 when he qualified for the US Open.

After starting out slowly, Udomchoke shocked Nalbandian by winning the third and fourth sets.

In the 2007 Australian Open, Udomchoke advanced to the third round, losing to 14th-seeded Novak Djokovic after defeating 24th-seeded Juan Carlos Ferrero.

In the 15th Asian Games held in Doha, Qatar, he won the gold medal for Thailand, after beating Korean Lee Hyung-taik in two sets, 7–5 and 6–3, in the men's singles tournament.