He won a 1990 Oscar not for acting but for directing "Dances with Wolves"
Dances with Wolves earned twelve Academy Award nominations and 
won... [DOC] [TLE] 63rd Academy Awards - Wikipedia [PAR] The 63rd Academy Awards ceremony, organized by the Academy of Motion 
Picture Arts and Sciences (AMPAS), took place on March 25, 1991, at the Shrine 
Auditorium in Los Angeles beginning at 6:00 p.m. PST / 9:00 p.m. EST.