This article lists the official squads for the 1991 Rugby World Cup that took place in England, Ireland, Scotland, Wales and France between 3 October and 2 November 1991. Players marked (c) were named as captain for their national squad. All details, such as number of international caps and player age, are current as of the opening day of the tournament on 3 October 1991.

Pool A

England

Head coach: 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Geoff Cooke

Italy

Head coach: 🇫🇷 Bertrand Fourcade

New Zealand

Head coaches: 🇳🇿 John Hart and 🇳🇿 Alex Wyllie

United States

Head coach: 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Jim Perkins

Pool B

Ireland

Head coach: Ciaran Fitzgerald

Japan

Head coach: 🇯🇵 Hiroaki Shukuzawa

Scotland

Head coach: Ian McGeechan

Zimbabwe

Trainer: Iain Buchanan

Pool C

Argentina

Head coaches: 🇦🇷 Luis Gradín / 🇦🇷 Guillermo Lamarca

Australia

Head coach: 🇦🇺 Bob Dwyer

Wales

Head coach: 🏴󠁧󠁢󠁷󠁬󠁳󠁿 Alan Davies

Western Samoa

Pool D

Canada

Head coach: 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Ian Birtwell

Fiji

Head coaches: 🇫🇯 Samisoni Viriviri and 🇳🇿 George Simpkin

France

Head coach: 🇫🇷 Daniel Dubroca

Romania

Head coach: Peter Ianusevici