Tiemen Groen (6 July 1946 – 26 October 2021) was a Dutch cyclist who won four consecutive world titles in the 4 km individual pursuit in 1964–1967;[1] His sporting career began with DTS Zaandam.

[2] He finished fourth in this event at the 1964 Summer Olympics.

[3] He also won a silver medal in the team time trial at the 1966 UCI Road World Championships.

[4] Groen moved in 1995 to South Africa.

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