Callum Reese Lawson (born 27 February 1996) is a British professional basketball player who currently plays for Úrvalsdeild karla club Valur. He played college basketball for Western Wyoming Community College and Arizona Christian University before going on to play professionally. In 2021, he won the Icelandic championship as a member of Þór Þorlákshöfn. The following season he repeated as champion, this time with Valur.