Robert Maclennan, Baron Maclennan of Rogart, Scottish politician
Robert Adam Ross Maclennan, Baron Maclennan of Rogart, (26 June 1936 – 18 January 2020) was a British Liberal Democrat politician and life peer.

He was the last leader of the Social Democratic Party (SDP), serving during the negotiations that led to its merger with the Liberal Party in 1988. He then became joint interim leader of the new party, known as the Social and Liberal Democrats (SLD) and later as the Liberal Democrats. He served as a Member of Parliament (MP) from 1966 to 2001, when he was elevated to the House of Lords.