Ann Bates (c. 1748 – c. 1801) was a loyalist spy during the American Revolution. Originally from Philadelphia, Pennsylvania, Bates was known for her awareness, her intelligence, and her ability to remain calm under pressure. She was commonly referred to as "Mrs. Barnes" by affiliates in her spy networks. She was known to carry an unknown unique token that would eventually identify her as a British spy. She would go on to become a part of British General Clinton's espionage network, and would help the British combat American forces on several fronts. She reportedly took part in various clandestine spy missions between 1778 and 1780. Bates was most well known for her missions completed at George Washington's base camp in White Plains, New York, and during the Rhode Island Campaign or the Battle of Rhode Island.