Antoni Castells (born September 24, 1950 in Barcelona, Spain) is a Catalan politician. He is considered as one of the most prominent members of the Catalanist wing of the Socialists' Party of Catalonia.
Castells is married and has two children. He lives in Barcelona. He received an Economy degree and a PhD at the University of Barcelona.
He is a lecturer in Public Revenue at the UB. He has been a visiting professor at the Johns Hopkins University of Baltimore (1993) and director of The Institute of Economy of Barcelona until, November 2003.
He has written many books about the topics which he is specialized: fiscal federalism, autonomous and local revenue, regional economy and the economy of the welfare state.
He has been working in the Study Service for the Banca Catalana (until 1983), and member of Audit Office of Catalonia (1984–1989), member of the Catalan part of the Mixed Committee of State-Generalitat Assessment (1989–1996), member of the Catalan Parliament (1992–1994) and Spanish member of the European Court of Auditors (1994–2000).
Currently Secretary of the Economy of the PSC Executive Committee.