This chapter concerns the British general elections of February 1974, October 1974, and 1979 during what came to be known as the ‘Decade of Dealignment’. The first two contests were closely fought, resulting in no overall majority (February 1974) and a slender Labour majority (October 1974). However, the resulting Labour governments were beset by severe economic problems, leading some commentators to claim that Britain had become ‘ungovernable’. In the 1979 general election the Conservatives returned to office under a leader (Margaret Thatcher) who was determined to reverse the country’s post-war decline. In each case, relevant developments in the preceding inter-election period are described (including trends in party popularity) and an account of the campaign provided. In addition, the election results themselves—patterns of party support and of turnout—are extensively analysed. The chapter also focuses on three areas investigated by researchers at the time—explanations for non-voting, the sources of support for the Liberal Party, and the rise of ‘issue voting’.