Sarah Virginia Brinton, Baroness Brinton, known as Sal Brinton, is a British politician who served as president of the Liberal Democrats from 2015 to 2020. In November 2010 she was nominated to the House of Lords, taking her place on 10 February 2011 having been created Baroness Brinton, of Kenardington in the County of Kent on 4 February. After Jo Swinson lost her seat at the 2019 United Kingdom general election, Brinton and Sir Ed Davey became acting co-leaders of the Liberal Democrats. After Brinton's term as party president ended, her successor Mark Pack also succeeded her as acting co-leader with Davey. Davey was elected as permanent leader of the party in 2020.

The president of the Liberal Democrats chairs the Federal Board of the Liberal Democrats of the United Kingdom.