Lise Ellner is an American open water swimmer and attorney from Vashon, Washington. Ellner frequently swims in the East Passage between Vashon Island and Seattle together with Amy Bogaard and Ann White. She has also swum along the Dungeness Spit in 2011 and around Blake Island in 2010 in the state of Washington.
Ellner graduated from law school at Lewis & Clark College, Northwestern School of Law and has an undergraduate degree from Columbia University. She was admitted to The State Bar of California on 1 December 1992.