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 are the defending champions.
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 the four games
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
Head coach: Ciaran Fitzgerald
Head coach: Jim Telfer
Head coach: Ron Waldron