Jan Gualtherus van Breda Kolff (18 January 1894 – 6 February 1976) was a Dutch amateur football player.

[1] Van Breda Kolff made his debut in the Netherlands national team as a player of HVV Den Haag on 2 April 1911 at the age of 17, and (as of 2014) he still holds the record as the youngest player to have ever played for "Oranje".

[2] During his debut in a 3–1 win over Belgium he scored the second goal to give the Dutch a 2–0 lead.

In total, he played 11 international matches, including four games at the 1912 Summer Olympics, where he won the bronze medal in a 9–0 win over Finland.

[5] Van Breda Kolff later had a career as a stockbroker in the United States.