- Source: Koistinen
- Katri Helena
- Kementerian Perang Amerika Serikat
- Daftar Duta Besar Finlandia untuk Indonesia
- American Expeditionary Force
- Keterlibatan Amerika Serikat dalam Perang Dunia I
- Daftar anggota Parlemen Finlandia
- Koistinen
- Otto Koistinen
- Hannu Koistinen
- Katri Helena
- Koistinen Kantele
- Al Koistinen
- Markus Koistinen
- Lights in the Dusk
- Ritva Koistinen
- Ville 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