Sir William Courtenay, 2nd Baronet (11 March 1676 – 6 October 1735) was an English landowner.
He was the son of Francis Courtenay (died 1699) and grandson of Sir William Courtenay, 1st Baronet; he succeeded his grandfather in the baronetcy in 1702. He represented Devonshire in the House of Commons from 1701 to 1710 and was Lord Lieutenant of Devon from 1714 to 1716.
He married Anne, daughter of James Bertie, 1st Earl of Abingdon, and their children included William Courtenay, 1st Viscount Courtenay and Henry Reginald Courtenay.
In 1831 he was recognised as having been de jure 6th Earl of Devon.