Arnoldo Martínez Verdugo (12 January 1925 – 24 May 2013) was a Mexican socialist politician and democracy activist.
A long-standing leader of the Mexican Communist Party and the Unified Socialist Party of Mexico (PSUM), Martínez promoted political self-criticism, refused to support regional guerrilla movements, condemned the Soviet invasion of Czechoslovakia and promoted the unification of the political left.