Altosaar is an Estonian surname.
As of 1 January 2021, 44 men and 42 women have the surname Altosaar. In terms of the distribution of surnames in Estonia, Altosaar ranks 2,438th for men and 2,879th for women.[1] The surname Altosaar is most commonly found in Valga County, where there are 7.86 per 10,000 inhabitants of the county bear the name.
Notable people with the surname Altosaar include: