Ann-Sophie Duyck (born 23 July 1987) is a Belgian triathlete and former racing cyclist,[5] who rode professionally between 2012 and 2021 for six different teams.

She competed in the 2013 UCI women's team time trial in Florence.

[6] By winning her fourth Belgian National Time Trial Championships in 2017, Duyck became the first Belgian road cyclist to win four consecutive titles in their discipline.