Osvaldo Álvarez Guerrero (1940 – 27 July 2008) was an Argentine Radical Civic Union (UCR) politician. He served as Governor of Río Negro Province and as a National Deputy. Born in Florida (a suburb of Buenos Aires, Álvarez Guerrero joined the Radical Civic Union of the People (UCRP, the more conservative faction led by Ricardo Balbín) in 1958 in his home town of Vicente López, a neighboring community. He became a lawyer and relocated to Viedma, in Río Negro Province, in 1964. UCR Governor appointed him subsecretary of social affairs, serving in that post until the military coup of 28 June 1966 which toppled President Arturo Illia. That year he moved to San Carlos de Bariloche, where he practiced as a lawyer, taught philosophy and wrote for newspapers including La Nación and Diario Río Neg