The Social-Green Party (abbreviated SGP) is a political party in the Southern Arc Islands. It is currently one of the largest parties in both the First and Second Chambers. Its current leader/chairman is Lionel Sheraldin (of the Sheraldin family), the incumbent Prime Minister.

The SGP generally takes a left-wing, environmentalist viewpoint. It was formed in 1989 from a merger between the Green Party and the Socialist Party, and its main colour is yellow, representing a mixture between the colours of its two precursor parties (green and red, respectively).