Theresa Mary, Lady May (; née Brasier; born 1 October 1956) is a British retired politician who served as Prime Minister of the United Kingdom and Leader of the Conservative Party from 2016 to 2019. She previously served as Home Secretary from 2010 to 2016. She was Member of Parliament (MP) for Maidenhead from 1997 to 2024. May is the second female UK prime minister, after Margaret Thatcher, and the first woman to hold two of the Great Offices of State. Ideologically, May is a one-nation conservative.

May grew up in Oxfordshire and attended St Hugh's College, Oxford. After graduating in 1977, she worked at the Bank of England and the Association for Payment Clearing Services. She also served as a councillor for Durnsford in Merton. After two unsuccessful attempts to be elected to the House of Commons, she was elected as the MP for the new seat of Maidenhead at the 1997 general election. From 1999 to 2010, May held several roles in shadow cabinets, and was Chair of the Conservative Party from 2002 to 2003.