Sportsmen
- John Spencer (snooker player) (1935–2006), English snooker player
- John Spencer (footballer) (born 1970), former Scottish football player, Manager of the Portland Timbers
- John Spencer (rugby union) (born 1947), former English national rugby union team captain
- John Spencer (cricketer, born 1949), former Sussex cricketer
- John Spencer (cricketer, born 1954), former Wiltshire cricketer
- John Spencer (rugby), New Zealand dual-international
- John A. Spencer (european basketball), Howard University Graduate, undrafted Rookie Free Agent for the Charlotte Hornets in 1988. After being cut from the Hornets, established a 14 year career as a European Import Player.
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