| Nana Osei Bonsu II | |
| Mampongmanhene of Mampong | |
| Succession: | Regent of the Asante Kingdom |
| Reign: | 25 February 1999 – 26 April 1999 |
| Coronation: | 25 February 1999 |
| Predecessor: | Opoku Ware II |
| Spouse: | Janet Dorothy Owusu-Sechere, eldest child of the late JH Owusu-Sechere Commissioner of Police CID/Special Branch |
| House: | Bretuo Dynasty |
| Father: | Kessie |
| Mother: | Mary Gyimah |
| Full Name: | Daasebre Nana Osei Bonsu II |
| Birth Date: | 31 December 1939 |
| Birth Place: | Mampong, Kingdom of Ashanti |
Daasebre Nana Osei Bonsu II, also known as Saint Oswald Gyimah-Kessie (born 31 December 1939) served as the regent of the Kingdom of Ashanti from 25 February 1999 to 26 April 1999. Osei Bonsu II is the Mamponghene (Duke
Osei Bonsu II was educated at Prempeh College and at the University of Ghana, where he graduated in 1972 with a BA in economics, political science and modern history.[2] Osei Bonsu II became the registrar of the Kwame Nkrumah University of Science and Technology, Ashanti, in 1991.[2]
As Chairman of the Energy Commission, Nana Osei Bonsu II attracted criticism in 2005 over Commission funds that were used to buy new cars for himself and the Commission's Secretary, Kofi Asante.[3]