Lord Polwarth, of Polwarth in the County of Berwick, is a title in the Peerage of Scotland. It was created in 1690 for Sir Patrick Hume of Polwarth, 2nd Baronet, Lord Chancellor of Scotland from 1696 to 1702. In 1697 he was further created Lord Polwarth, of Polwarth, Redbraes and Greenlaw, Viscount of Blasonberrie and Earl of Marchmont, also in the Peerage of Scotland. Upon the death of his grandson, the third Earl, the creations of 1697 became dormant (unclaimed).

Patrick Hume, 1st Earl of Marchmont, known as Sir Patrick Hume, 2nd Baronet from 1648 to 1690 and as Lord Polwarth from 1690 to 1697, was a Scottish statesman. His grandfather was the poet and courtier Sir Patrick Hume of Polwarth and Redbraes who died in 1609.