Onuma Sittirak (Thai: อรอุมา สิทธิรักษ์, RTGS: On-uma Sitthirak, pronounced [ʔɔ̄ːn.ʔū.māː sìt.tʰí.rák]; born June 13, 1986, in Khian Sa) is a Thai volleyball player and was a member of Thailand women's national volleyball team.

In 2009, she helped the Thai team won the Asian Championship for the first time and was also awarded the Most Valuable Player of the tournament.

[2] During the tournament, she was called "Thailand's Toy Cannon" in an article by the Asian Volleyball Confederation.

[3] In addition, Onuma won the 2009 Asian Club Championship with her team Federbrau and was selected as the Most Valuable Player and Best Spiker.

[4] She repeated as champion in the 2010 Asian Club Championship and also won the Best Spiker and Best Scorer of the event.