Jordi Arquer i Saltor (19071981) was a Spanish communist politician and writer from Catalonia.
Arquer was born in Barcelona in 1907.
During the dictatorship of Miguel Primo de Rivera, he participated in the clandestine opposition, collaborating with the independentista groups of Francesc Macià. He was a part of the Centre Autonomista de Dependents del Comerç i de la Indústria and the newspaper Lluita. In 1927 he was one of the founders of the Círculo de Estudios Marxistas (Circle of Marxist Studies), and in 1928 participated in the clandestine congress of the Partit Comunista Català (Catalan Communist Party), which attracted Marxist militants from the Estat Català.
Once the Second Spanish Republic was proclaimed, Arquer was one of the founders of a Communist "Right Opposition" party, Bloc Obrer i Camperol (BOC), and an advocate of the Working Alliance (Aliança Obrera). In 1931 he published Los comunistas ante el problema de las nacionalidades ibéricas, and after reviewing the history of Catalonia and the Catalan movement, was favorable to the recognition of self-determination of Catalonia and indicated the convenience of a Union of Iberian Socialist Republics.
1n 1935, BOC merged with the Trotskyist Communist Left of Spain (Izquierda Comunista de España; ICE) to form POUM, bringing together communists dissatisfied with the other communist and socialist parties in Spain. During the Spanish Civil War (1936–1939), he was one of the organizers and heads of the POUM militia, which operated on the Aragon front.
Arquer went into exile in France in 1939. There he formed the Moviment Socialista de Catalunya (Catalan Socialist Movement). He continued to advocate for this organisation in publications and magazines such as Endavant, L'Insurgent, Quaderns de l'exili, La Nostra Revista (Mexico), Ressorgiment (Argentina), Germanor (Chile) and others, circulated in countries including the United States.
In 1977, Arquer moved back to Barcelona, where he resided until his death in 1981.