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- Lahdenpohja – was lost to the USSR in 1944
- Lammi – consolidated with Hämeenlinna in 2009
- Lappee – became part of the City of Lappeenranta in 1967
- Lappi – consolidated with Rauma in 2009
- Lappfjärd – became part of the City of Kristinestad in 1973
- Lauritsala – consolidated with Lappeenranta in 1967
- Lavansaari – was lost to the USSR in 1944
- Leivonmäki – became part of Joutsa in 2008
- Lemu – consolidated with Masku in 2009
- Liljendal – consolidated with Loviisa in 2010
- Lohjan kunta and Lohja were consolidated to form Lohja in 1997
- Lohjan maalaiskunta – renamed as Lohjan kunta in 1978
- Lohtaja – consolidated with Kokkola in 2009
- Loimaan kunta and Loimaa consolidated to form Loimaa in 2005
- Loimaan maalaiskunta – renamed as Loimaan kunta in 1978
- Lokalahti – became part of the City of Uusikaupunki in 1981
- Lumivaara – was lost to the USSR in 1944
- Luopioinen – became part of Pälkäne in 2007
- Längelmäki – was divided in 2007 between Jämsä and Orivesi
Read more about this topic: Former Municipalities Of Finland