Kälin or Kaelin is a surname, and may refer to:
Alfred Kälin (born 1949), Swiss cross country skier Alois Kälin (born 1939), Swiss Nordic skier Annik Kälin (born 2000), Swiss athlete Barbara Marty Kälin (1954–2022), Swiss politician Bernard Kälin (1887–1962) Swiss Benedictine monk Carolyn Kaelin (1961–2015), American surgeon Charles S. Kaelin (1858–1929), American painter Christian Kälin (born 1971), Swiss lawyer and businessman Franz Kälin (born 1939), Swiss cross-country skier Irène Kälin (born 1987), Swiss politician of the Green Party Karl Kälin (1943–2023), Swiss psychologist Karl Kälin (priest) (1870–1950), Swiss Jesuit priest, translator, and writer Kato Kaelin (born 1959), American actor Nadja Kälin (born 2001), Swiss cross-country skier
Stefan Kälin (born 1942), Swiss alpine skier Urs Kälin (born 1966), Swiss alpine skier Walter Kälin (born 1951), Swiss humanitarian and lawyer William Kaelin Jr. (born 1957), American Nobel laureate and professor of medicine
See also Kalin (disambiguation)