Mary Kelly Foy (née McStea; born 27 February 1968)[1] is a British Labour Party politician serving as the Member of Parliament (MP) for the City of Durham since the 2019 general election.

On 15 October 2020, Foy resigned as Parliamentary Private Secretary to Andy McDonald to vote against the proposed Covert Human Intelligence Sources (Criminal Conduct) Bill, disagreeing with the Labour whip to abstain.

Foy had met with representatives of the diocese and the governing body, Durham County Council officers and elected officials, parents and the local community to listen to concerns and to help find a way to resolve the situation.

As part of this committee, Foy tabled several amendments relating to smoking health, including banning a loophole which enables vapes to be handed out for free to underage people and raising the age of sale of cigarettes to 21.

[9][better source needed] Foy held her seat in the 2024 general election, with 47.1% of the vote and a majority of 11,757 over the second-placed Reform UK candidate.