Thomas of Marle, Lord of Coucy and Boves, was a medieval French nobleman. He was born in 1073 to Enguerrand I of Boves, the Lord of Coucy, and his wife Adele of Marle. After the death of his father, Thomas became the Lord of Coucy and of his family's other holdings. As the best-known of the Lords of Coucy, Thomas of Marle became infamous for his aggressive and brutal tactics in war and his continued rebellion against the authority of King Louis VI.