The Alliance for Green Socialism (AGS) is a socialist grouping based in Leeds in the United Kingdom. It was formed in 2003 following a merger between the Leeds Left Alliance (formed by Mike Davies, Celia Foote, Garth Frankland and other former members of the Labour Party) and the Green Socialist Network (whose origins lie in the Communist Party of Great Britain). Both these groups had been in the former Socialist Alliance and the AGS remained involved in it too until it was dissolved in February 2005.