The Liberal Democrats are a political party in the United Kingdom. Party members elect the leader of the Liberal Democrats, the head and highest-ranking member of the party. Liberal Democrat members of Parliament also elect a deputy leader of the Parliamentary Party in the House of Commons, often colloquially referred to as the deputy leader. Under the federal constitution of the Liberal Democrats the leader is required to be a member of the House of Commons.

David Martin Scott Steel, Baron Steel of Aikwood, is a retired Scottish politician. Elected as Member of Parliament for Roxburgh, Selkirk, and Peebles, followed by Tweeddale, Ettrick, and Lauderdale, he served as the final leader of the Liberal Party, from 1976 to 1988. His tenure spanned the duration of the alliance with the Social Democratic Party, which began in 1981 and concluded with the formation of the Liberal Democrats in 1988.