Cangas Left Alternative (Alternativa Canguesa de Esquerda in Galician language; ACE) is a coalition of 3 political parties and various independents in the municipality of Cangas, Pontevedra.

In the municipal elections of May 27, 2007 ACE gained 1,890 votes, the 13.1% of the total vote, and three councilors out of a total of 21. ACE supported and participated in a government of the Galician Nationalist Bloc (BNG) and the Socialists' Party of Galicia (PSdG). On January 28, 2010 ACE broke the agreement (in a decision that was taken in an open assembly) due to the supposed attacks of the BNG against the elected representatives of ACE.^[1] ACE supported a local social movement called A Ría Non se Vende (The ría is not for sale) against the plans of the local government to build a new port in an area with historic and natural values. 49 neighbors of Cangas were judged due to the incidents during the demonstrations against the new port,^[2] including various members of ACE.

In 2011 ACE reached 1,744 votes, which accounted for the 12.77% of the vote, keeping the 3 Councillors. In the local elections of 2015 ACE gained 4 town councillors (2 of the Galician People's Front and two of the United Left) and, for the first time, the mayorship of the municipality thanks to a pact with the BNG and Assembly for Unity (ASpUN).^[3]

In the 2023 election the ACE called for a vote for Alternativa dos Veciños (AV). The party gained 863 votes (6,4%) and one seat.

• SON