| Sein Tun | |
| Native Name: | Burmese: စိန်ထွန်း |
| Other Names: | Sein Htoon |
| Birth Date: | 1939 |
| Birth Place: | Rangoon, British Burma |
| Death Place: | Yangon, Myanmar |
| Nationality: | Burmese |
| Known For: | Head of Yangon University's physics department |
| Occupation: | Physicist |
| Alma Mater: | St. Paul's High School Rangoon University (B.Sc. Physics, 1962) University of Surrey (M.Sc. Physics, 1967) (Ph.D Physics, 1973) |
Sein Tun (my|စိန်ထွန်း, also spelt Sein Htoon) was a Burmese physicist, who taught at the Yangon University from 1994 until his retirement in 2006.[1] He also authored teaching materials for advanced physics and was a member of the Science Council and a fellow at the Institute of Physics.[1]