Freisler (also spelled Freissler) is a German surname. Notable people with the surname include:
- Anton Freissler (1838–1916), Austrian elevator manufacturer
- Fritz Freisler (1881–1955), Austrian screenwriter and film director
- Marion Freisler (1910–1997), wife of Roland Freisler
- Oswald Freisler (1895–1939), German lawyer and brother of Roland Freisler
- Roland Freisler (1893–1945), German jurist