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- Teisko – was divided between Tampere and Kuru in 1972
- Temmes – became part of Tyrnävä in 2001
- Tenala – became part of the City of Ekenäs in 1993
- Terijoki – was lost to the USSR in 1944
- Terjärv – consolidated with Kronoby in 1969
- Toijala – consolidated with Viiala to form Akaa in 2007
- Tottijärvi – became part of the City of Nokia in 1976
- Turtola – renamed as Pello in 1949
- Tuulos – consolidated with Hämeenlinna in 2009
- Tuupovaara – became part of the City of Joensuu in 2005
- Tyrvää – became part of Vammala in 1973, originally Vammala was separated from Tyrvää in 1915
- Tyrväntö – became part of Hattula in 1971
- Tytärsaari – was lost to the USSR in 1944
Read more about this topic: Former Municipalities Of Finland