The Socialist League (Finnish: Sosialistiliitto) was a Trotskyist organisation in Finland.

At its founding the Communist Youth was close to the "new" Communist Party of Finland (SKP) but supporters of the SKP left the organisation after the name change.

They founded Communist Youth League of Finland in 2000.

The Socialist League published the magazines Murros and Antikapitalisti.

The organisation was active in different left led protests.