Sarah Jane Olney (née McGibbon; born 11 January 1977) is a British Liberal Democrat politician who has served as the Member of Parliament (MP) for Richmond Park since 2019, previously holding the seat from 2016 to 2017.

[9][4] She worked as an accountant at Barclays, Arts & Business, Distilled Ltd, SCi Sales Group and the National Physical Laboratory in Teddington until she entered politics after the 2015 general election.

[11][12] On 25 October 2016, Conservative MP Zac Goldsmith announced his resignation from the House of Commons over his objection to his party's support for a third runway at Heathrow Airport, triggering a by-election in his seat of Richmond Park.

At the snap 2017 general election, Olney lost her seat in Richmond Park, coming second with 45.1% of the vote behind Zac Goldsmith, who stood as the Conservative candidate.

[26][27] On 9 September 2017, it was announced that she would be taking up the post of chief of staff for Liberal Democrat leader Sir Vince Cable.

[28] It was reported by the Evening Standard in April 2018 that Olney had been interviewed under caution by the police for allegedly breaking official spending limits in the Richmond Park by-election.

[37] In 2002, she married Benjamin (Ben) James Olney, a town planner presently working as a manager for High Speed 1.