Karl Gustaf Ingvar Wixell, (May 7, 1931 – October 8, 2011) was a Swedish baritone who had an active international career in operas and concerts from 1955 to 2003. He mostly sang roles from the Italian repertory, and, according to The New York Times, "was best known for his steady-toned, riveting portrayals of the major baritone roles of Giuseppe Verdi — among them Rigoletto, Simon Boccanegra, Amonasro in Aida and Germont in La traviata.