Supporting Ranking 100 Nominees

1. 1972
2. 1993
3. 1954
4. 1961
5. 1968
6. 1979
7. 2010
8. 1941
9. 1984
10. 1950
11. 2000
12. 1960
13. 1997
14. 1976
15. 1948
16. 1940
17. 2003
18. 1936
19. 1985
20. 1953

1. Al Pacino in The Godfather (1972)
2. Haing S. Ngor in The Killing Fields (1984)
3. Ralph Fiennes in Schindler' List (1993) 
4. Jackie Gleason in the Hustler (1961)
5. Rod Steiger in On the Waterfront (1954)
6. George Sanders in All About Eve (1950)
7. Sydney Greenstreet in The Maltese Falcon (1941)
8. Willem Dafoe in Shadow of the Vampire (2000)
9. Walter Huston in The Treasure of the Sierra Madre (1948)
10. Jack Albertson in The Subject Was Roses (1968)
11. Montgomery Clift in Judgment At Nuremberg (1961) 
12. Robert Duvall in Apocalypse Now (1979)  
13. Lee J. Cobb in On the Waterfront (1954) 
14. George C. Scott in The Hustler (1961)
15. Karl Malden in On the Waterfront (1954)
16. Walter Brennan in The Westerner (1940)
17. Pete Postlethwaite in In the Name of the Father (1993)
18. James Caan in The Godfather (1972)
19. Charles Coburn in The Devil and Miss Jones (1941)
20. Laurence Olivier in Marathon Man (1976)
21. Joel Grey in Cabaret (1972)
22. Gene Wilder in The Producers (1968)
23. Justin Henry in Kramer Vs. Kramer (1979) 
24. Seymour Cassel in Faces (1968)
25. Burgess Meredith in Rocky (1976) 
26. John Hawkes in Winter's Bone (2010)
27. Sam Jaffe in The Asphalt Jungle (1950)
28. Peter Falk in Murder, Inc. (1960) 
29. Benicio Del Toro in Traffic (2000)
30. Christian Bale in The Fighter (2010)
31. Tim Robbins in Mystic River (2003)
32. Walter Brennan in Come and Get It (1936) 
33. Burt Reynolds in Boogie Nights (1997)
34. Klaus Maria Brandauer in Out of Africa (1985)
35. Leonardo DiCaprio in What's Eating Gilbert Grape (1993)
36. Donald Crisp in How Green Was My Valley (1941)
37. Sal Mineo in Exodus (1960)
38. Frederic Forrest in The Rose (1979)
39. Geoffrey Rush in The King's Speech (2010)
40. John Malkovich in In the Line of Fire (1993)
41. Peter Ustinov in Spartacus (1960)
42. Robert Forster in Jackie Brown (1997)
43. Eddie Albert in The Heartbreak Kid (1972)
44. Jeremy Renner in The Town (2010)
45. Adolph Caesar in A Soldier's Story (1984)
46. Greg Kinnear in As Good As It Gets (1997)
47. Robert Duvall in The Godfather (1972)
48. Cecil Kellaway in The Luck of the Irish (1948)
49. Jack Kruschen in The Apartment (1960)
50. Erich von Stroheim in Sunset Blvd. (1950)
51. Robert Strauss in Stalag 17 (1953)
52. Mickey Rooney in The Black Stallion (1979) 
53. Charles Bickford in Johnny Belinda (1948)
54. Pat Morita in The Karate Kid (1984)
55. Jack Wild in Oliver! (1968)
56. Albert Finney in Erin Brockovich (2000)
57. Ken Watanabe in The Last Samurai (2003)
58. Anthony Hopkins in Amistad (1997)
59. John Malkovich in Places in the Heart (1984)
60. Walter Brennan in Sergeant York (1941)
61. Jason Robards in All the President's Men (1976)
62. Robert Loggia in Jagged Edge (1985)
63. Jack Palance in Shane (1953)
64. Peter Falk in Pocketful of Miracles (1961)
65. Edmond O'Brien in The Barefoot Contessa (1954)
66. Ned Beatty in Network (1976)
67. Edmund Gwenn in Mister 880
68. Albert Bassermann in Foreign Correspondent (1940) 
69. Basil Rathbone in Romeo and Juliet (1936)
70. James Stephenson in The Letter (1940)
71. Alec Baldwin in The Cooler (2003)
72. Melvyn Douglas in Being There (1979)
73. Jeff Bridges in The Contender (2000)
74. Jack Oakie in The Great Dictator (1940)
75. Mark Ruffalo in The Kids are All Right (2010)
76. Ralph Richardson in Greystoke (1984)
77. Djimon Honsou in In America (2003)
78. Benicio Del Toro in 21 Grams (2003)
79. Tommy Lee Jones in The Fugitive (1993)
80. Burt Young in Rocky (1976)
81. Robin Williams in Good Will Hunting (1997)
82. William Gargan in They Knew What They Wanted (1940)
83. William Hickey in Prizzi's Honor (1985)
84. Jeff Chandler in Broken Arrow (1950)
85. Oskar Homolka in I Remember Mama (1948)
86. Akim Tamiroff in The General Died at Dawn (1936)
87. Brandon De Wilde in Shane (1953)
88. Joaquin Phoenix in Gladiator (2000)
89. Daniel Massey in Star! (1968)
90. Eddie Albert in Roman Holiday (1953)
91. Chill Wills in The Alamo (1960)
92. James Gleason in Here Comes Mr. Jordan (1941) 
93. Stuart Erwin in Pigskin Parade (1936)
94. Tom Tully in The Caine Mutiny (1954)
95. Frank Sinatra in From Here to Eternity (1953)
96. George Chakiris in West Side Story (1961)
97. Jose Ferrer in Joan of Arc (1948)
98. Mischa Auer in My Man Godfrey (1936)
99. Don Ameche in Cocoon (1985)
100. Eric Roberts in Runaway Train (1985)

And my Winners Are:

                              Walter Brennan As Swan Bostrum

                                  Walter Brennan as Judge Roy Bean

                            Sydney Greenstreet as Kasper Gutman

                                 Walter Huston as Howard

                                  George Sanders as Addison De Witt

                       Robert Strauss as Stanislas 'Animal' Kasava

                            Rod Steiger as Charley Malloy 

                             Peter Falk as Abe 'Kid Twist' Reles

                                Jackie Gleason as Minnesota Fats

                           Jack Albertson as John Cleary

                           Al Pacino as Micheal Corleone

                          Laurence Olivier as Dr. Christian Szell

                              Robert Duvall as Lt. Col. Bill Kilgore

                              Haing S. Ngor as Dith Pran

     Klaus Maria Brandauer as Baron Bror von Blixen-Finecke

                                       Ralph Fiennes as Amon Goeth

                                       Burt Reynolds as Jack Horner

                                  Willem Dafoe as Max Schreck

                                 Tim Robbins as Dave Boyle

                              John Hawkes as Teardrop

This category is not the strongest but there are certainly strong performances to be found within it. Sorry about the lack of a video but I could not find good enough footage of Jack Albertson and Peter Falk.

Most Wins: Walter Brennan with two
Most Reviewed: Walter Brennan with three
Winners in Both Lead and Supporting: Laurence Olivier, Rod Steiger, Robert Duvall, Walter Huston
Films with Winners in Both Lead and Supporting: On The Waterfront, Schindler's List
Noticeable Trend: A good amount of my winners are villains or antagonistic characters.
Academy Agreements: 7
Most Pleasant Surprise: Pete Postlethwaite in In the Name of the Father