[edit]
J
[edit]
Jack Clark
- Shows: Mastermind (1990).
[edit]
Jack Waley-Cohen

- Shows: Number One (2001).
[edit]
James Bitton
- Shows: Mastermind (1981).
[edit]
James Davis
- Shows: Mastermind (1979).
[edit]
Jean Burke
- Shows: Mastermind (1987).
[edit]
Jeffrey Boss
- Shows: Mastermind (1973).
[edit]
Jennifer Keaveney
- Shows: Mastermind (1986).
[edit]
Jeremy Bradbrooke
- Shows: Mastermind (1987).
[edit]
Jeremy Paxman

- Quiz Presenter: University Challenge (1995-present).
[edit]
Jill Goodwin
- Shows: Mastermind (1984).
[edit]
Jill McFatridge
- Shows: Mastermind (1987).
[edit]
Jim Cook

[edit]
Jim Eccleson
[edit]
Joan Bridgman
- Shows: Mastermind (1987).
[edit]
Joan Taylor
- Shows: Mastermind (1972).
[edit]
Joe Brookstone
- Shows: Mastermind (1994).
[edit]
Joe West
- Shows: Mastermind (1979, 1996).
[edit]
John Burke (1)
- Shows: Mastermind (1985).
[edit]
John Burke (2)
- Shows: Mastermind (1993).
[edit]
John Clarke
[edit]
John Coggrove
- Shows: Mastermind (1994).
[edit]
John Coleby
- Shows: Mastermind (1973).
[edit]
John Colverson
- Shows: Mastermind (1993).
[edit]
John Crawford
- Shows: Mastermind (1981).
[edit]
John Crippin
- Shows: Mastermind (1987).
[edit]
John Edmond
- Shows: Mastermind (1983).
[edit]
John Emmines
[edit]
John George
- Shows: Mastermind (1978).
[edit]
John Gibson
- Shows: Mastermind (1975).
[edit]
John Hart
- Shows: Mastermind (1975).
[edit]
John Jenkins

[edit]
John Keogh
- Shows: Mastermind (1980).
[edit]
John M. Lewis

- Quiz Devisor: Fifteen to One.
[edit]
John McLeod
- Shows: Mastermind (1979).
[edit]
John Palmer-Barnes
- Shows: Mastermind (1976).
[edit]
John Sykes
- Shows: Mastermind (1976).
[edit]
John Widdowson
- Shows: Mastermind (1977).
[edit]
John Wilson
- Shows: Mastermind (1994).
[edit]
Jon Goodwin

[edit]
Juilus Green
- Shows: Mastermind (1972).
[edit]
Julian Allen

