His Majesty's Most Loyal Opposition

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His Majesty's Most Loyal Opposition (called Her Majesty's Most Loyal Opposition when a queen reigns), often abbreviated to HM Most Loyal Opposition, commonly known as the Official Opposition, and colloquially The Opposition, is the main political opposition in the United Kingdom to His Majesty's Government. This is usually the largest political party in the House of Commons that does not form part of the government or a governing coalition.

Since July 2024, the Official Opposition has been the Conservative Party, with outgoing prime minister Rishi Sunak serving as Leader of the Opposition until the Conservative Party leadership election in November 2024 when newly elected party leader Kemi Badenoch took over the position.