Sir James Shaw Willes (1814 – 2 October 1872) was a Judge of the English Court of Common Pleas.
Willes was born in Cork. He was educated at Trinity College, Dublin, where he took his BA degree in 1836 (and later received an honorary LLD in 1860). Four years later, he was called to the English Bar at Inner Temple and commenced practice on the Home Circuit.
In 1850, he was appointed to the Common Law Commission, and did useful service in the preparation of the several Law Procedure Acts. When he was forty-one years old, he was appointed a puisne judge of the Common Pleas, receiving the honour of knighthood at the same time. "He was esteemed one of the wisest and most learned of English lawyers, displaying in his decisions not only a rare and profound knowledge of principles, but a wonderful power of dealing with complicated facts and evidence. His decisions on questions of mercantile and maritime law were especially lucid and convincing.