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Koskinen is a surname originating in Finland (in Finnish, it means "small rapids"), where it is the ninth most common^[1] surname. Notable people with the surname include:

• Aarno Yrjö-Koskinen (1885–1951), Finnish politician, ambassador and freiherr
• Harri Koskinen (born 1970), Finnish designer
• Heikki Koskinen (born 1930), Finnish chess master
• Jari Koskinen (born 1960), Finnish politician, Minister for Agriculture and Forestry of Finland
• Johannes Koskinen (born 1954), Finnish politician (M.P., Minister of Justice)
• John Koskinen (born 1939), American former U.S. Commissioner of Internal Revenue and former president of the U.S. Soccer Foundation
• Joonas Koskinen (born 1987), Finnish ice hockey player
• Jukka Koskinen (born 1982), Finnish musician (bassist for Norther, Wintersun)
• Jukka Koskinen (footballer) (born 1972), Finnish football (soccer) player
• Kalle Koskinen (born 1972), Finnish ice hockey player
• Kerkko Koskinen (born 1973), Finnish musician
• Lennart Koskinen (born 1944), clergyman in the Church of Sweden, serving as bishop in Visby
• Luanne Koskinen (born 1940), American politician
• Mikko Koskinen (born 1988), Finnish hockey player for the Edmonton Oilers of the National Hockey League
• Pasi Koskinen (born 1972), Finnish vocalist (Amorphis)
• Petri Koskinen (born 1983), Finnish ice hockey player
• Riina Koskinen (born 1997), Finnish squash player
• Rolf Koskinen (1939–2010), Finnish orienteering competitor, European champion
• Sampo Koskinen (born 1979), Finnish football (soccer) player
• Sauli Koskinen (born 1985), Finnish TV/radio personality and entertainment reporter
• Tapio Koskinen (born 1953), Finnish ice hockey player
• Yrjö Sakari Yrjö-Koskinen (1830–1903), Finnish politician (senator, Finnish Party), professor, historian