Hard left is a political term often used pejoratively particularly when discussing political tendencies within the UK Labour Party and is used to describe various sections of the British Left, both inside and outside the Labour Party. The term is sometimes used in contrast to the soft left. The term often has negative connotations and has been used by Labour's political opponents, notably during the Conservative Party's election campaigns of the early 1990s, and in the conservative media; however, left wing, centre-left and non-partisan publications occasionally use the term to describe elements to the left of the Labour movement.

Far-left politics or extreme-left politics are politics further on the left of the left-right spectrum than the mainstream political left.