Merneferre Ay was an ancient Egyptian pharaoh of the mid 13th Dynasty. The longest reigning pharaoh of the 13th Dynasty, he ruled a likely fragmented Egypt for over 23 years in the early to mid 17th century BC. A pyramidion bearing his name shows that he possibly completed a pyramid, probably located in the necropolis of Memphis.

The Thirteenth Dynasty of ancient Egypt was a series of rulers from approximately 1803 BC until approximately 1649 BC, i.e. for 154 years. It is often classified as the final dynasty of the Middle Kingdom, but some historians instead group it in the Second Intermediate Period.