Sven Petrus Ekman (31 May 1876, Uppsala – 2 February 1964, Uppsala) was a Swedish zoologist, biogeographer, zoogeographer, and limnologist, known for the Ekman grab sampler. Ekman was the son of the Lutheran pastor Fredrik Ekman and Sofia Ekman, née Svensson. He enrolled at Uppsala University where he received a baccalaureate degree in 1899, a licentiate in 1903, and a doctorate in 1904. He was a lecturer in zoology at Uppsala University from 1904 to 1909 and again from 1916 to 1927. In the intervening years, he taught biology and chemistry at a secondary school in Jönköping from 1909 to 1916. In 1927 he became professor of zoology at Uppsala University; he retired in 1941 as professor emeritus. In 1937 he was elected to the Royal Swedish Academy of Sciences, and in 1939 to the Royal Physi