John 'Jackie' Millsopp (17 July 1930 – 17 September 1952) was a Scottish footballer who played for Celtic.

Career and death Having joined as a youth player from Junior club Blantyre Celtic three years earlier, Millsopp made his debut for Celtic in a Glasgow Cup tie against Queens Park in September 1950.

Capable of playing in several positions, by 1952 he was establishing himself in the Celtic side when he suffered a burst appendix; he died in hospital from complications shortly afterwards at the age of 22.

Players from Celtic and Old Firm rivals Rangers were among a large crowd of mourners who attended the funeral in Millsopp's home town of Cambuslang, which took place on the morning of a match between the teams on 20 September 1952.

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