Clifford Warren Ashley (December 18, 1881 - September 18, 1947) was an American author, sailor, and artist. He is perhaps most famous for The Ashley Book of Knots, an encyclopedic reference manual with directions for and illustrations of thousands of knots. He invented the Ashley's stopper knot. Ashley also wrote The Yankee Whaler, a study of sperm whale hunters in New England in the late 18th century and early 19th century.

He was born in New Bedford, Massachusetts and died in Westport, MA.