Sæther is a Norwegian surname. Notable people with the surname include:

• Andrine Sæther (born 1964), Norwegian actress
• Bjarne Berg-Sæther (1919–2009), Norwegian politician for the Labour Party
• Gjøran Sæther (born 1982), Norwegian artist and painter
• Harald Sæther (born 1946), Norwegian composer
• Jan Valentin Sæther (1944–2018), Norwegian figurative painter, sculptor and Gnosticism priest
• Morten Sæther (born 1959), Norwegian cyclist
• Ole Sæther (1870-1946), Norwegian rifle shooter
• Olaf Sæther (1872-1945), Norwegian rifle shooter
• Peder Sæther (1810-1886), Norwegian-American banker
• Svein Ole Sæther (born 1948), Norwegian diplomat
• Wera Sæther (born 1945), Norwegian psychologist and writer