The Lethbridge Baronetcy, of Westaway House in Devon and Winkley Court in the County of Somerset, is a title in the Baronetage of the United Kingdom. It was created on 15 June 1804 for John Lethbridge, who was later Member of Parliament (MP) for Minehead in Somerset, from 1806 to 1807. The second Baronet sat as MP for Somerset between 1806 and 1812 and 1826 and 1830.

Sir John Lethbridge, 1st Baronet, of Whitehall Place, Westminster; Sandhill Park, Somerset; Westaway in the parish of Pilton, Devon, and Winkleigh Court, Winkleigh, Devon, was Member of Parliament for Minehead in Somerset from 1806 to 1807. He served as Sheriff of Somerset in 1788–9. In 2010 it was discovered that Lethbridge had been the biological father of Claire Clairmont, and thus the grandfather of Clairmont's daughter with Lord Byron, Allegra.