| Peter Mathieson | |
| Birth Name: | Peter Emil Thomas Schwartz |
| Birth Date: | 1 December 1914 |
| Birth Place: | New Plymouth, New Zealand |
| Death Place: | Queensland, Australia |
| Country: | New Zealand |
| Sport: | Swimming |
| Nationals: | 100 yds backstroke champion (1938, 1939, 1947, 1949, 1950)[1] |
| Show-Medals: | yes |
Peter Emil Thomas Mathieson (né Schwartz; 1 December 1914 – 12 October 1986) was a New Zealand swimmer who won a bronze medal representing his country at the 1950 British Empire Games.
At the 1950 British Empire Games he won the bronze medal as part of the men's 330 yards medley relay. His teammates for the relay were Lyall Barry and John Shanahan. He also competed in the men's 100 yards backstroke where he placed 4th.[2]