[All information is taken from the Academy Awards Database
I have seen the movies in red.
1927/28 - Emil Jannings - The Last Command (Actor)
1928/29 - Warner Baxter - In Old Arizona (Actor)
1929/30 - George Arliss - Disraeli (Actor)
1930/31 - Lionel Barrymore - A Free Soul (Actor)
1931/32 (tie) - Wallace Beery - The Champ and Fredric March - Dr. Jekyll and Mr. Hyde (Actor)
1932/33 - Charles Laughton -- The Private Life of Henry VIII (Actor)
1934 - Clark Gable - It Happened One Night (Actor)
1935 - Victor McLaglen - The Informer (Actor)
1936 - Paul Muni - The Story of Louis Pasteur (Actor)
1937 - Spencer Tracy - Captains Courageous (Actor)
1938 - Spencer Tracy -- Boys Town (Actor)
1939 - Robert Donat - Goodbye, Mr. Chips (Actor)
1940 - James Stewart - The Philadelphia Story (Actor)
1941 - Gary Cooper - Sergeant York (Actor)
1942 - James Cagney - Yankee Doodle Dandy (Actor)
1943 - Paul Lukas - Watch on the Rhine (Actor)
1944 - Bing Crosby - Going My Way (Actor)
1945 - Ray Milland - The Lost Weekend (Actor)
1946 - Fredric March - The Best Years of Our Lives (Actor)
1947 - Ronald Colman - A Double Life (Actor)
1948 - Laurence Olivier - Hamlet (Actor)
1949 - Broderick Crawford - All the King's Men (Actor)
1950 - José Ferrer - Cyrano de Bergerac (Actor)
1951 - Humphrey Bogart - The African Queen (Actor)
1952 - Gary Cooper - High Noon (Actor)
1953 - William Holden - Stalag 17 (Actor)
1954 - Marlon Brando - On the Waterfront (Actor)
1955 - Ernest Borgnine - Marty (Actor)
1956 - Yul Brynner - The King and I (Actor)
1957 - Alec Guinness - The Bridge on the River Kwai (Actor)
1958 - David Niven - Separate Tables (Actor)
1959 - Charlton Heston - Ben-Hur (Actor)
1960 - Burt Lancaster - Elmer Gantry (Actor)
1961 - Maximilian Schell - Judgment at Nuremberg (Actor)
1962 - Gregory Peck - To Kill a Mockingbird (Actor)
1963 - Sidney Poitier - Lilies of the Field (Actor)
1964 - Rex Harrison - My Fair Lady (Actor)
1965 - Lee Marvin - Cat Ballou (Actor)
1966 - Paul Scofield - A Man for All Seasons (Actor)
1967 - Rod Steiger - In the Heat of the Night (Actor)
1968 - Cliff Robertson - Charly (Actor)
1969 - John Wayne - True Grit (Actor)
1970 - George C. Scott - Patton (Actor)
1971 - Gene Hackman - The French Connection (Actor)
1972 - Marlon Brando - The Godfather (Actor)
1973 - Jack Lemmon - Save the Tiger (Actor)
1974 - Art Carney - Harry and Tonto (Actor)
1975 - Jack Nicholson - One Flew over the Cuckoo's Nest (Actor)
1976 - Peter Finch - Network
1977 - Richard Dreyfuss - The Goodbye Girl
1978 - Jon Voight - Coming Home
1979 - Dustin Hoffman - Kramer vs. Kramer
1980 - Robert De Niro - Raging Bull
1981 - Henry Fonda - On Golden Pond
1982 - Ben Kingsley - Gandhi
1983 - Robert Duvall - Tender Mercies
1984 - F. Murray Abraham - Amadeus
1985 - William Hurt - Kiss of the Spider Woman
1986 - Paul Newman - The Color of Money
1987 - Michael Douglas - Wall Street
1988 - Dustin Hoffman - Rain Man
1989 - Daniel Day Lewis - My Left Foot
1990 - Jeremy Irons - Reversal of Fortune
1991 - Anthony Hopkins - The Silence of the Lambs
1992 - Al Pacino - Scent of a Woman
1993 - Tom Hanks - Philadelphia
1994 - Tom Hanks - Forrest Gump
1995 - Nicolas Cage - Leaving Las Vegas
1996 - Geoffrey Rush - Shine
1997 - Jack Nicholson - As Good as It Gets
1998 - Roberto Benigni - Life Is Beautiful
1999 - Kevin Spacey - American Beauty
2000 - Russell Crowe - Gladiator
2001 - Denzel Washington - Training Day
2002 - Adrien Brody - The Pianist
2003 - Sean Penn - Mystic River
2004 - Jamie Foxx - Ray
2005 - Philip Seymour Hoffman - Capote
2006 - Forest Whitaker - The Last King of Scotland
2007 - Daniel Day-Lewis - There Will Be Blood
2008 - Sean Penn - Milk
2009 - Jeff Bridges - Crazy Heart
2010 - Colin Firth - The King's Speech
