Masing is a German and Estonian surname. Notable people with the surname include:
- (1836âÂÂ1923), Baltic German philologist
- (1845âÂÂ1936), Baltic German linguist
- Jaan Masing (1875âÂÂ1948), Estonian politician and physician
- Johannes Masing (born 1959), German judge, jurisprudent and public law scholar
- (1879âÂÂ1956), Baltic German physician
- (1874âÂÂ1947), Baltic German philologist
- Otto Wilhelm Masing (1763âÂÂ1832), Estonian linguist and clergyman
- Uku Masing (1909âÂÂ1985), Estonian philosopher, translator, theologist and folklorist
- Viktor Masing (1925âÂÂ2001), Estonian botanist and ecologist
- Walter Masing (1915âÂÂ2004), Baltic German physicist