Uxbridge and South Ruislip is a constituency in Greater London represented in the House of Commons of the UK Parliament. The seat has been held by the Conservative Party since its 2010 creation. Since 2015 it has been represented by Boris Johnson, who served as Prime Minister of the United Kingdom from 2019 to 2022. Johnson's 2017 majority in Uxbridge and South Ruislip was 5,034 votes which was less than half his 2015 majority. After his election as Prime Minister, in the subsequent 2019 election Johnson retained the seat with an increased vote share of 52.6% and a majority of 7,210.