- Stirling Silliphantscreenplay &
- Wolf Rillascreenplay &
- Ronald Kinnochscreenplay (as George Barclay)
- John Wyndhamnovel "The Midwich Cuckoos"
- Teri Scoble(as Theresa Scoble)
- Janice Hawley(as Janice Howley)
Rest of cast listed alphabetically
- John Adams(uncredited)
- Chris Adcock(uncredited)
- Jack Armstrong(uncredited)
- Barbara Bennett(uncredited)
- Wallace Bosco(uncredited)
- Ted Carroll(uncredited)
- Dan Cressey(uncredited)
- George Curtis(uncredited)
- Helen Ford(uncredited)
- Denis Gilmore(uncredited)
- Pat Hagan(uncredited)
- Aidan Harrington(uncredited)
- Philip Johns(uncredited)
- Mary Maxfield(uncredited)
- Colin McKenzie(uncredited)
- Pat Meehan(uncredited)
- Arnold Schulkes(uncredited)
- Jack Silk(uncredited)
- John Timberlake(uncredited)
- Jim Tyson(uncredited)
- Ronald Kinnochproducer
- Geoffrey Faithfullcinematographer (photographed by)
- Irene Howardcasting director (uncredited)
- Eric Aylottmakeup artist
- Joan Johnstonehairdresser
- Denis Johnsonproduction manager
- David Middlemasassistant director
- Michael Stevensonthird assistant director (uncredited)
- Gordon Danieldubbing editor
- J.B. Smithdubbing mixer
- Cyril Swernsound recordist
- A.W. Watkinsrecording supervisor
- Tom Howardphotographic effects
- Frank Drakecamera operator
- Gerald Mossphotographer: second unit
- Dennis Frasergrip (uncredited)
- Eileen Sullivanwardrobe supervisor
- Ron Goodwinconductor (uncredited)
- Lee Turnercontinuity
- Eddie Frewindriver: generator (uncredited)
Crew verified as complete
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