Katy Marchant (born 30 January 1993) is an elite British track cyclist who specialises in the sprint disciplines.

She won gold as part of the Great Britain women's sprint team at the 2024 Summer Olympics in Paris, and was a European champion in the 500 metre time trial in 2024.

Marchant began her sporting life as a heptathlete, and represented Great Britain in that event at the 2012 World Junior Championships.

[5] At the 2018 British National Track Championships she won her second time trial and sprint titles to take her tally to six in total.

[8] At the 2024 Summer Olympics, Marchant, alongside teammates Sophie Capewell and Emma Finucane, won the gold medal in the women’s team sprint.