Patrick Lyon of Auchterhouse (1669 – 13 November 1715) was a Scottish politician.

He was the second son of Patrick Lyon, 3rd Earl of Strathmore and Kinghorne and his wife Helen, daughter of John Middleton, 1st Earl of Middleton. He married his second cousin Margaret, daughter of James Carnegie of Finhaven, but they had no children.

He represented the barons of Forfarshire in the last Parliament of Scotland, 1702 to 1707. He was killed fighting on the Jacobite side at the Battle of Sheriffmuir.