Twan Castelijns (born 23 January 1989 in Hapert, North Brabant, Netherlands) is a Dutch former cyclist, who rode professionally between 2014 and 2017 for the Koga Cycling Team, Baby-Dump Cyclingteam and LottoNL–Jumbo squads.

[1] During his career, he contested two Grand Tours; the 2016 Giro d'Italia,[2] and the 2017 Giro d'Italia.

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