Jan Herman "Caius" Welcker (9 July 1885 – 13 February 1939) was a Dutch football (soccer) player who competed in the 1908 Summer Olympics.

[1] Welcker, who formed the famous right wing of his club side Quick and the national team with Edu Snethlage, won 15 caps, scoring five times.

[2] He was a member of the Dutch team, which won the bronze medal in the football tournament.

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