Hannah Mary Barnes (born 4 May 1993) is a British racing cyclist, who rides for UCI Women's WorldTeam Uno-X Mobility.

Born in Tunbridge Wells, Kent, Barnes grew up in Bladon, Oxfordshire and later moved to Towcester, Northamptonshire.

As a junior rider, she also won the senior women's British National Circuit Race Championships in 2010 and 2011.

Originally she had been demoted to second place, behind Laura Trott, for her victory celebration which was deemed to be dangerous riding,[6] but this decision was later reversed.

[10] In August 2021 it was announced that Barnes would be leaving Canyon–SRAM for the new Uno-X Pro Cycling Team, due to commence competing from 2022.