Percival Guy Tunmer (1 December 1948 – 22 June 1999) was a racing driver from South Africa.

He participated in one Formula One World Championship Grand Prix, his home race in 1975, driving a Lotus 72 for a local team, Team Gunston.

He finished 11th, scoring no championship points.

[1] Guy Tunmer was killed in a motorcycle accident in his native South Africa in 1999.

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