Thassha Vitayaviroj (Thai: ธัชชา วิทยวิโรจน์; 10 June 1986) is a former professional Thai tennis player.

[1] Vitayaviroj has career-high WTA rankings of 439 in singles, achieved on 2 May 2005, and 320 in doubles, set on 24 April 2006.

She won five doubles titles on the ITF Women's Circuit.

Her only WTA Tour main-draw appearance came at the 2002 Volvo Women's Open, where she partnered with Montinee Tangphong in the doubles event.

[2] Playing for Thailand Fed Cup team, Vitayaviroj has a win–loss record of 0–1.