Soosaar is an Estonian surname, meaning "swamp (bog) island". It may refer to:
Albert Soosaar (1906–1995), clergyman Eduard Soosaar (1911–1979), clergyman Enn Soosaar (1937–2010), translator, critic, columnist and publicist Kaia Soosaar (born 1993), long jumper Mark Soosaar (born 1946), film director and politician Marti Soosaar (born 1977), decathlete Martti Soosaar (1933–2017), journalist and writer Sven-Erik Soosaar (born 1973), linguist