List of Chief Ministers of Assam(since 1937)

1. Maulavi Saiyid Sir Muhammad Saadulla(April 1, 1937-September 19, 1938)
2. Gopinath Bordoloi(September 19, 1938-November 17, 1939)
3. Maulavi Saiyid Sir Muhammad Saadulla(November 17, 1939-December 24, 1941)
4. Maulavi Saiyid Sir Muhammad Saadulla(August 25, 1942-February 11, 1946)
5. Gopinath Bordoloi(February 11, 1946-August 6, 1950)
6. Bishnu Ram Medhi(August 9, 1950-December 27, 1957)
7. B.P. Chaliha(December 28, 1957-November 6, 1970)
8. Mohendra Mohan Choudhury(November 11, 1970-January 30, 1972)
9. Shri Sarat Chandra Sinha(January 31, 1972-March 12, 1978)
10. Shri Golap Borbora(March 12, 1978-September 4, 1979)
11. Shri Jogendra Nath Hazarika(September 9, 1979-December 11, 1979)
12. Shrimati Anowara Taimur(December 6, 1980-June 30, 1981)
13. Shri Kesab Chandra Gogoi(January 13, 1982-March 19, 1982)
14. Shri Hiteswar Saikia(February 27, 1983-December 23, 1985)
15. Shri Prafulla Kumar Mahanta(December 24, 1985-November 27, 1990)
16. Shri Hiteswar Saikia(June 30, 1991-April 22, 1996)
17. Dr. Bhumidhar Barman(April 22, 1996-May 14, 1996)
18. Shri Prafulla Kumar Mahanta(May 15, 1996-May, 17, 2001)
19. Shri Tarun Gogoi(May 17, 2001-till date) 

Source:

• Wikipedia
• http://assamassembly.gov.in/index.html