William Bearclaw was a Starfleet line officer on active duty in the 23rd century.
As an ensign, Bearclaw served under James T. Kirk on USS Enterprise. (DC Comics: Star Trek: The Original Series) He was a son of Captain John Bearclaw, of the USS Gallant, and Lila Bearclaw.
Years later, as a captain, Bearclaw settled a dispute between two Klingon battle squadrons during the evacuation from Qo'noS. (USS Cheyenne Operations Manual)
In the 24th century, a Cheyenne-class exploration cruiser would be named after him.