Since the founding of the Communist Party of Finland in 1918, the party has seen multiple splits and breakaway factions. Some of the breakaway organisations have thrived as independent parties, some have become defunct, while others have merged with the parent party or other political parties.
| Year | Party | Leader | Status | |
|---|---|---|---|---|
| 1920 | Socialist Workers' Party [1] | August Raatikainen | defunct | |
| 1929 | Left Group of Finnish Workers [2] The group had supporters mainly in the southern industrial cities of Finland. [3] [4] [5] [6] | Niilo Wälläri | defunct | |
| 1986 | Democratic Alternative [7] [8] [9] [10] [11] | Kristiina Halkola | defunct | |
| 1988 | Communist Workers' Party – For Peace and Socialism [12] [13] | Mikko Vartiainen | active | |
| 1994 | Communist Party [14] | Juha-Pekka Väisänen | active | |
| 1999 | Workers' Party of Finland [15] [16] [17] [18] | Juhani Tanski | defunct | |