John Williamson can refer to different persons:
- John Williamson (economist), senior at Institute for International Economics;
- John Williamson (singer), an Australian singer
- John Williamson (singer & songwriter), from Georgia, U.S.A.
- John Williamson (basketball), a former professional basketball player with the New York Nets.
- John Williamson (politician), a 19th century New Zealand politician
- John Williamson (geologist), a Canadian geologist and developer of the Williamson diamond mine in Tanzania (d. 1958)
- Jack Williamson, an American science fiction writer
- John Finley Williamson, conductor, musician, and co-founder of Westminster Choir College.
- John Newton Williamson (1855-1943), US Representative from Oregon
- John Parshall Williamson, Student, Ohio State University