Lotte Hass (born Charlotte Hildegard Baierl; 6 November 1928 - 14 January 2015 (age 86)) was an Austrian underwater diver, model and actress. She was the second wife of the Austrian naturalist and diving pioneer Hans Hass (1919-2013), and worked as a model and actress in several of his underwater natural history films. She was inducted into the Women Divers Hall of Fame and the International Scuba Diving Hall of Fame in 2000.