Tammy van Wisse (born 23 July 1968 in Melbourne, Victoria) is a long-distance swimmer from Australia.
1990 she won the Lake Zurich Swim.
As a marathon swimmer she swam the Murray River in 2001, a distance of 2,438 kilometres and the English Channel in 1993 in a time of 8h 35mins and again in 1994 in a time of 8h 33mins.
In July 2006, van Wisse broke an 81-year-old record for the 35-mile swim from New York City to Sandy Hook, and retired from competitive swimming the same year to start a family, 20 years after her first marathon swim.
She now works as an environmentalist and a motivational speaker.