| Mahn Thet San | |
| Native Name: | မန်းသက်စံ |
| Birth Date: | 1930 |
| Birth Place: | Kawhnat village, Moulmein Township, British Burma |
| Death Date: | 10 October 2008 (aged 78) |
| Death Place: | Mayangone Township, Yangon, Myanmar |
| Resting Place: | Yayway Cemetery, Yangon |
| Nationality: | Myanmar |
| Alma Mater: | University of Illinois (M.S. Chemistry, 1955) (Ph.D. Chemistry, 1957) |
| Occupation: | Academic |
| Spouse: | Htay Yee |
| Children: | 2 |
Mahn Thet San (Burmese: မန်းသက်စံ; 1930–2008) was a Burmese academic and civil servant of ethnic Mon descent, known for his work in preserving Mon literature and culture.[1] Born in Kawhnat village in Moulmein Township, he was educated at the University of Illinois, where he earned master's and doctoral degrees in chemistry in 1955 and 1957 respectively.[1] He served as the deputy minister of the Ministry of Industry, and as rector of Moulmein College and Bassein Degree College.[1]
Thet San died on 10 October 2008 at his home in Mayangone Township, Yangon and was subsequently buried at Yayway Cemetery. He was 78 (in his 79th year).[1]