Radical Liberal Party is the name of some political parties around the world. It usually designates a party that is ideologically liberal or left wing. For more information on liberal parties, see liberal parties.

Ecuador — Ecuadorian Radical Liberal Party

Paraguay — Authentic Radical Liberal Party

In the play Jumpers, by Tom Stoppard, the Radical Liberals have just won an election. In the Confederate States of America of Harry Turtledove's Timeline-191 alternate history series, the Radical Liberal Party is the main opposition to the dominant Confederate States Whig Party, before the rise of Jake Featherston's fascist Freedom Party.