John Thomas Alderdice, Baron Alderdice (born 28 March 1955), is a Northern Ireland politician. He was the Speaker and a Member of the Northern Ireland Assembly (MLA) for East Belfast from 1998 to 2004 and 1998 to 2003, respectively. Alderdice was the leader of the Alliance Party of Northern Ireland from 1987 to 1998, and since 1996 has sat in the House of Lords as a Liberal Democrat.
