Sophie Thornhill (born 9 February 1996)[1] is a visually impaired English former racing cyclist who competed in para-cycling tandem track events.

[1][3] She met the para-cyclist Anthony Kappes, also visually impaired, via her uncle; he encouraged her to train as a track cyclist.

[5][6] Her first major international competition was the UCI Para-cycling Track World Championships in Aguascalientes, Mexico, in April 2014.

[19][20] Sarah Storey commented: "They had a superbly executed start – they have worked so hard on that aspect of their training – and with the turbo intervals they have done they were able to bring it home strongly.

[23] At the 2016 Rio Paralympics Thornhill won gold in the 1km time trial B[24] and bronze in the individual pursuit B,[4] on both occasions alongside Helen Scott.

[25] In June 2020, Thornhill announced her retirement from competition, after the 2020 Summer Paralympics were delayed by a year due to the COVID-19 pandemic.