- England
- France
- Ireland
- Scotland
- Wales
{{main|1990 Five Nations Championship}}EnglandHead coach: Geoff Cooke - Paul Ackford
- Rob Andrew
- Mark Bailey
- Steve Bates
- Alan Buzza
- Will Carling (c.)
- Fran Clough
- Wade Dooley
- David Egerton
- Jerry Guscott
- Simon Halliday
- Richard Hill
- Simon Hodgkinson
- Mark Linnett
- Brian Moore
- John Olver
- Jeff Probyn
- Paul Rendall
- Mickey Skinner
- Mike Teague
- Rory Underwood
- Jon Webb
- Peter Winterbottom
FranceHead coach: Jacques Fouroux - Marc Andrieu
- Louis Armary
- Pierre Berbizier (c.)*
- Serge Blanco
- Dominique Bouet
- Didier Camberabero
- Alain Carminati
- Éric Champ
- Denis Charvet
- Jean Condom
- Thierry Devergie
- Dominique Erbani
- Jean-Pierre Garuet-Lempirou
- Fabrice Heyer
- Peyo Hontas
- Bernard Lacombe
- Thierry Lacroix
- Jean-Baptiste Lafond
- Patrice Lagisquet
- Jean-Marc Lhermet
- Thierry Maset
- Éric Melville
- Franck Mesnel
- Pascal Ondarts
- Marc Pujolle
- Laurent Rodriguez (c.)**
- Olivier Roumat
- Henri Sanz
- Éric Sauboua
- Philippe Sella
- Frédéric Velo
(*) Captain in the first two games(**) Captain in the third and fourth gamesIrelandHead coach: Ciaran Fitzgerald - Fergus Aherne
- Willie Anderson (c.)*
- Michael Bradley
- Paul Collins
- Keith Crossan
- Phil Danaher
- Des Fitzgerald
- Neil Francis
- Mick Galwey
- Gary Halpin
- Kenneth Hooks
- David Irwin
- Ralph Keyes
- Michael Kiernan
- Donal Lenihan (c.)**
- Noel Mannion
- Phillip Matthews
- Denis McBride
- John McDonald
- Brendan Mullin
- Kenny Murphy
- Pat Murray
- Pat O'Hara
- James O'Riordan
- Nick Popplewell
- Peter Russell
- Brian Smith
- Steve Smith
(*) Captain in the first two games(**) Captain in the third and fourth gamesScotlandHead coach: Jim Telfer - John Allan
- Gary Armstrong
- Alex Brewster
- Paul Burnell
- Finlay Calder
- Craig Chalmers
- Damian Cronin
- Peter Dods
- Chris Gray
- Gavin Hastings
- Scott Hastings
- John Jeffrey
- Sean Lineen
- Graham Marshall
- Kenny Milne
- Greig Oliver
- Craig Redpath
- Graham Shiel
- David Sole (c.)
- Tony Stanger
- Iwan Tukalo
- Derek Turnbull
- Alan Watt
- Doddie Weir
- Derek White
- Douglas Wyllie
WalesHead coach: John Ryan/Ron Waldron - Andy Allen
- Allan Bateman
- Andy Booth
- Chris Bridges
- Tony Clement
- Richie Collins
- Carwyn Davies
- Phil Davies
- Laurance Delaney
- Alan Edmunds
- David Evans
- Steve Ford
- Mike Griffiths
- Mike Hall
- Garin Jenkins
- Arthur Jones
- Gary Jones
- Mark Jones
- Robert Jones (c.)
- Gareth Llewellyn
- Martyn Morris
- Kevin Moseley
- Mark Perego
- Kevin Phillips
- Rowland Phillips
- Jeremy Pugh
- Mark Ring
- Paul Thorburn
- Mark Titley
- Ian Watkins
- Brian Williams
- Hugh Williams-Jones
{{DEFAULTSORT:1990 Five Nations Championship Squads}} 1 : Six Nations Championship squads |