Alan James Beith, Baron Beith, Kt PC (born 20 April 1943) is a British Liberal Democrat politician who represented Berwick-upon-Tweed as its Member of Parliament (MP) from 1973 to 2015. From 1992 to 2003 he was Deputy Leader of the Liberal Democrats. By 2015 he was the longest-serving member of his party's House of Commons delegation, and was the last Liberal Democrat MP to have experience of Parliament in the 1970s. Beith was elevated as a life peer in the 2015 Dissolution Honours List and took his title and a seat on the House of Lords Opposition benches on 23 November 2015.