Koistinen

Koistinen is a Finnish surname. Notable people with the surname include:


 * Al Koistinen (born 1948), American former politician
 * Hannu Koistinen (born 1966), Finnish kantele maker
 * Katri Helena Kalaoja (née Koistinen, born 1945), Finnish singer known by her stage name Katri Helena
 * Markus Koistinen (born 1970), retired Finnish shot putter
 * Matti Koistinen (born 1986), Finnish ice hockey player
 * Otto Koistinen (1925–2020), Finnish kantele maker
 * Petteri "Kode" Koistinen, Finnish guitarist, member of the Finnish rock band Neljä Ruusua
 * Ritva Koistinen (born 1956), Finnish kantele player
 * Ville Koistinen (born 1982), Finnish ice hockey player