TMDB
6.7
1,131 votes
| Roy Scheider | Dr. Heywood Floyd | 1 |
| John Lithgow | Dr. Walter Curnow | 2 |
| Helen Mirren | Tanya Kirbuk | 3 |
| Bob Balaban | Dr. R. Chandra | 4 |
| Keir Dullea | Dr. David Bowman | 5 |
| Douglas Rain | HAL 9000 (voice) | 6 |
| Madolyn Smith Osborne | Caroline Floyd | 7 |
| Savely Kramarov | Dr. Vladimir Rudenko | 8 |
| Taliesin Jaffe | Christopher Floyd | 9 |
| James McEachin | Victor Milson | 10 |
| Mary Jo Deschanel | Betty Fernandez | 11 |
| Elya Baskin | Maxim Brailovsky | 12 |
| Dana Elcar | Dimitri Moisevitch | 13 |
| Oleg Rudnik | Dr. Vasili Orlov | 14 |
| Natasha Shneider | Irina Yakunina | 15 |
| Vladimir Skomarovsky | Yuri Svetlanov | 16 |
| Victor Steinbach | Nikolaj Ternovsky | 17 |
| Candice Bergen | SAL 9000 (voice) | 18 |
| Gene McGarr | Commercial Announcer | 19 |
| Herta Ware | Jessie Bowman | 20 |
| Jan Tříska | Alexander Kovalev | 21 |
| Larry Carroll | Anchorman on TV | 22 |
| Cheryl Carter | Nurse | 23 |
| Ron Recasner | Hospital Neurosurgeon | 24 |
| Robert Lesser | Dr. Hirsch | 25 |
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