Koster (surname)

Koster is the Dutch word for sexton or verger (Küster in German), derived from the Latin custos.

Koster is a common surname in the Netherlands, ranking 45th in 2007 (15,898 people). People with the surname "Koster" or "De Koster" include:
 * Adam de Koster (1586–1643), Flemish painter
 * Adrie Koster (born 1954), Dutch footballer
 * Annelise Koster (born 1999), Namibian artistic gymnast
 * Anouska Koster (born 1993), Dutch racing cyclist
 * Bo Koster (born 1974), American rock musician
 * Chava Koster, Dutch rabbi
 * Chris Koster (born 1964), American politician from Missouri
 * Chris Koster (musician), Canadian singer-songwriter
 * Claudia Koster (born 1992), Dutch road cyclist
 * Cornelis H. A. Koster (1943–2013), Dutch computer scientist
 * Daphne Koster (born 1981), Dutch footballer
 * Dominique Koster (born 1977), South African sprinter
 * Emma Koster (born 1984), Australian athlete
 * Everhardus Koster (1817–1892), Dutch land- and seascape painter
 * Fred Koster (1905–1979), American baseball player
 * George F. Koster (1927–2012), American physicist
 * Hans de Koster (1904–1992), Dutch politician
 * Henry Koster (1905–1988), German-born American film director
 * Henry Koster (author) (1793–1820), English coffee-grower, explorer, botanist and author
 * Irene Koster (1921–2012), Dutch swimmer
 * Jan Koster (born 1945), Dutch linguist
 * Jans Koster (born 1938), Dutch swimmer
 * Jared Koster (born 1991), Canadian football linebacker
 * Joëlle Rollo-Koster (born 1960s), French historian
 * John Koster (1844–1895), American impresario of the Koster and Bial's Music Hall
 * John Koster (born 1951), Washington State politician
 * Joséphine Thérèse Koster (1902–1986), botanist
 * Julian Koster (born 1972), American musician
 * Karen Koster (born 1980), Irish-Dutch television presenter
 * Kym Koster (born 1973), Australian rules footballer
 * Laure Koster (1902–1999), Luxembourgian swimmer
 * Laurens Janszoon Koster (c. 1370–1440), Dutch printer
 * Lou Koster (1889–1973), Luxembourgian composer and pianist
 * Luis Koster (1942–2021), Uruguayan basketball player
 * Martijn Koster (born c. 1970), Dutch software engineer
 * Martin Koster (born 1950), Dutch writer
 * Maureen Koster (born 1992), Dutch middle-distance runner
 * Nick Köster (born 1989), South African rugby union player
 * R. M. Koster (born 1934), American author
 * Raph Koster (born 1971), American computer entrepreneur
 * Samuel W. Koster (1919–2006), American army officer
 * Sepp Koster (born 1974), Dutch racing driver