| Gershon Beresford Onesimus Collier | |
| Office: | Sierra Leone's first permanent representative to the Headquarters of the United Nations of  Sierra Leoneto |
| Successor: | Christopher Okoro Cole |
| Office2: | of Sierra Leone to  United States |
| Predecessor2: | Richard Edmund Kelfa-Caulker |
| Successor2: | Christopher Okoro Cole |
| Office3: | Chief Justice of Sierra Leone |
| Predecessor3: | Sir Samuel Bankole Jones[1] |
| Successor3: | Banja Tejan-Sie |
| Birth Date: | 16 February 1927 |
| Birth Place: | Freetown |
| Death Place: | New York City |
| Father: | Samuel Adolphus Collier |
| Mother: | Maria Jeanette Collier |
| Spouse: | Fashn Dora (m. 1954) |
| Children: | 2 |
| Education: | CMS Grammar School and Fourah Bay College |
Gershon Beresford Onesimus Collier (February 16, 1927 – May 25, 1994) was a Sierra Leone Creole diplomat, Chief Justice of Sierra Leone, and educator.
Collier was called to the English Bar in London.[2]
When Albert Margai left the Sierra Leone People's Party in 1958, Collier went with him and became a member of the People's National Party's first executive committee.
In 1961, he became Sierra Leone's first permanent representative to the United Nations.[3]
In 1967, Margai arranged his nomination as Chief Justice of Sierra Leone. However, Margai lost the election in 1967 and Collier lost his office as Chief Justice.
In 1967, Collier immigrated to New York City, where he took a teaching appointment at New York University.[4]
Collier's granddaughter Napheesa Collier won a gold medal in basketball at the 2020 Summer Olympics and 2024 Summer Olympics.[5]