This is a list of the complete squads for the 1991 Five Nations Championship, an annual rugby union tournament contested by the national rugby teams of England, France, Ireland, Scotland and Wales. Scotland were the defending champions. The tournament was the 62nd edition of the Five Nations Championship and was held between 19 January and 16 March 1991. England emerged as champions, claiming their nineteenth outright title and achieving a Grand Slam—their first since 1980.
England
Head coach: Geoff Cooke
- Jason Leonard
- Brian Moore
- Jeff Probyn
- Paul Ackford
- Wade Dooley
- Peter Winterbottom
- Mike Teague
- Dean Richards
- Richard Hill
- Rob Andrew
- Rory Underwood
- Jerry Guscott
- Will Carling (c.)
- Nigel Heslop
- Simon Hodgkinson
England used the same 15 players in all four games.
France
Head coach: Daniel Dubroca
- Abdelatif Benazzi
- Pierre Berbizier
- Serge Blanco (c.)
- Xavier Blond
- Laurent Cabannes
- Didier Camberabero
- Marc Cécillon
- Denis Charvet
- Christophe Deslandes
- Jean-François Gourragne
- Thierry Lacroix
- Jean-Baptiste Lafond
- Patrice Lagisquet
- Grégoire Lascubé
- Philippe Marocco
- Pascal Ondarts
- Olivier Roumat
- Philippe Saint-André
- Philippe Sella
- Michel Tachdjian
Ireland
Head coach: Ciaran Fitzgerald
- Jack Clarke
- Keith Crossan
- David Curtis
- Des Fitzgerald
- John Fitzgerald
- Neil Francis
- Mick Galwey
- Simon Geoghegan
- Gordon Hamilton
- Kenneth Hooks
- Michael Kiernan
- Phillip Matthews
- Brendan Mullin
- Kenny Murphy
- Brian Rigney
- Brian Robinson
- Rob Saunders (c.)
- Brian Smith
- Steve Smith
- Jim Staples
Scotland
Head coach: Jim Telfer
- John Allan
- Gary Armstrong
- Paul Burnell
- Craig Chalmers
- Damian Cronin
- Chris Gray
- Gavin Hastings
- Scott Hastings
- John Jeffrey
- Sean Lineen
- Kenny Milne
- Alex Moore
- David Sole (c.)
- Tony Stanger
- Derek Turnbull
- Derek White
Wales
Head coach: Ron Waldron
- Paul Arnold
- Chris Bridges
- Alun Carter
- Tony Clement
- John Davies
- Phil Davies
- Ieuan Evans
- Luc Evans
- Steve Ford
- Glen George
- Scott Gibbs
- Mike Griffiths
- Neil Jenkins
- Arthur Jones
- Robert Jones
- Paul Knight
- Emyr Lewis
- Gareth Llewellyn
- Glyn Llewellyn
- Martyn Morris
- Paul Thorburn (c.)
- Brian Williams
