| Brian Reece |
Captain Bill Harper |
| Margot Grahame |
Wanda Sinclair |
| Raymond Huntley |
Colonel Bellamy |
| Sid James (as Sidney James) |
Ed Waggermeyer |
| Peter Sellers |
Private Goffin |
| Clive Morton |
Lt. General Sir Cuthbert Grahame Foxe |
| June Thorburn |
Veronica Bellamy |
| Maureen Swanson |
Joanne Delamere |
| Peter Martyn |
Lt. John Broke |
| Bill Fraser |
Private Slee |
| Edward Lexy |
Capt. Ledger |
| Tony Hancock |
Lt. Wilfred Cartroad |
| Michael Trubshawe |
Lt. MacAllister, A.D.C. |
| Maureen Pryor |
Miss Marigold, Continuity Girl |
| Barry McKay |
R.S.M. Benson |
| Mark Baker |
Scriptwriter |
| Donald Hewlett |
Lincoln Green |
| Reginald Hearne |
Sgt. Spurway |
| Stephen Vercoe |
American Marine Actor |
| David Green |
Mr. Shortchief, Assistant Director |
| Harold Ayer |
Sol Feinmesser |
| Barry Steele |
Orderly Clerk |
| Donald Pleasence (as Donald Pleasance) |
L/Cpl. Martin |
| Leonard Williams |
Corporal Smithers |
| Peter Haig |
Guard Sergeant |
| Eric Sykes |
Private Waterhouse |
| Gerald Campion |
Private Johnson |