These are the 1977 Five Nations Championship squads:[1]
Head coach: Peter Colston
- Bill Beaumont
- Martin Cooper
- Barrie Corless
- Fran Cotton
- Robin Cowling
- Peter Dixon
- Alastair Hignell
- Nigel Horton
- Charles Kent
- Tony Neary
- Mike Rafter
- Mike Slemen
- Steve Smith
- Peter Squires
- Roger Uttley (c.)
- Peter Wheeler
- Malcolm Young
Head coach: Jean Desclaux
- Jean-Michel Aguirre
- Jean-Luc Averous
- Jean-Pierre Bastiat
- Roland Bertranne
- Gérard Cholley
- Jacques Fouroux (c.)
- Dominique Harize
- Jean-François Imbernon
- Alain Paco
- Michel Palmie
- Robert Paparemborde
- Jean-Pierre Rives
- Jean-Pierre Romeu
- François Sangalli
- Jean-Claude Skrela
- France used the same 15 players during the competition
Head coach: Roly Meates
- Stephen Blake-Knox
- Jimmy Bowen
- Ned Byrne
- Shay Deering
- Willie Duggan
- Tony Ensor
- Thomas Feighery
- Ray Finn
- Brendan Foley
- Mike Gibson
- Tom Grace (c.)
- Ronnie Hakin
- Moss Keane
- Robbie McGrath
- Ian McIlrath
- Alistair McKibbin
- Stewart McKinney
- Freddie McLennan
- Charles Murtagh
- Phil Orr
- Michael Quinn
- John Robbie
- Fergus Slattery
- Harold Steele
- Pa Whelan
- Frank Wilson
Head coach: Bill Dickinson
- Jim Aitken
- Ian Barnes
- Mike Biggar
- Alex Brewster
- Sandy Carmichael
- Alastair Cranston
- Lewis Dick
- Bill Gammell
- Andy Irvine
- Wilson Lauder
- Alan Lawson
- Don MacDonald
- Duncan Madsen
- Ian McGeechan (c.)
- Alastair McHarg
- Doug Morgan
- Norman Pender
- Jim Renwick
- David Shedden
- Billy Steele
- Alan Tomes
- Bill Watson
- Ron Wilson
Head coach: John Dawes
- Phil Bennett (c.)
- Clive Burgess
- David Burcher
- Terry Cobner
- Gerald Davies
- Gareth Edwards
- Gareth Evans
- Trefor Evans
- Steve Fenwick
- Allan Martin
- Graham Price
- Derek Quinnell
- Glyn Shaw
- Jeff Squire
- Geoff Wheel
- Clive Williams
- J. J. Williams
- J. P. R. Williams
- Bobby Windsor