Cary Grant as Walter Christopher Eckland

Leslie Caron as Catherine Freneau

Trevor Howard as Commander Frank Houghton

Jack Good as Lieutenant Stebbings

Sharyl Locke as Jenny

Pip Sparke as Anne

Verina Greenlaw as Christine

Stephanie Berrington as Elizabeth Anderson

Jennifer Berrington as Harriet MacGregor

Laurelle Felsette as Angelique

Nicole Felsette as Dominique

Alex Finlayson as Doctor Bigrave

Peter Forster as Chaplain

Frank Marocco as Accordionist

John Napier as Lt. Cartwright

Simon Scott as Captain of Submarine, USS Sailfin

Don Spruance as Navigator

Ken Swofford as Helmsman, Submarine USS Sailfin

Richard Lupino as Radioman