| John Belushi | John 'Bluto' Blutarsky |
| Kevin Bacon | Chip Diller |
| Donald Sutherland | Prof. Dave Jennings |
| Karen Allen | Katy |
| Tim Matheson | Eric 'Otter' Stratton |
| John Vernon | Dean Vernon Wormer |
| Verna Bloom | Marion Wormer |
| Tom Hulce | Larry 'Pinto' Kroger (as Thomas Hulce) |
| Cesare Danova | Mayor Carmine DePasto |
| Peter Riegert | Donald 'Boon' Schoenstein |
| Stephen Furst | Kent 'Flounder' Dorfman |
| Sarah Holcomb | Clorette DePasto |
| Bruce McGill | Daniel Simpson 'D-Day' Day |
| Martha Smith | Barbara 'Babs' Jansen |
| Mary Louise Weller | Mandy Pepperidge |
| James Daughton | Greg Marmalard |
| Mark Metcalf | Doug Neidermeyer |
| James Widdoes |
Bluto, Otter and the rowdy Deltas make fools of the dean and the square Omegas at 1962 Faber College.
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