Marcelino Camacho Abad was a Spanish trade unionist and politician. He was a founding member of Comisiones Obreras (CCOO) and its first Secretary-General, holding this position between 1976 and 1987, and a communist deputy for Madrid Province between 1977 and 1981.

The Workers' Commissions since the 1970s has become the largest trade union in Spain. It has more than one million members, and is the most successful union in labor elections, competing with the Unión General de Trabajadores (UGT), which is historically affiliated with the Spanish Socialist Workers' Party (PSOE), and with the anarcho-syndicalist Confederación General del Trabajo (CGT), which is usually a distant third.