Thomas Musgrave, Captain of Bewcastle was an English landowner and soldier involved in Scottish border politics. He was keeper of Bewcastle Castle for Elizabeth I.
He was a younger son of Sir Simon Musgrave of Hartley and Edenhall (died 1597) and his wife Julian, a daughter of William Ellerker of Ellerker.[1] He was also known as Musgrave of Cumcatch. His father was Constable of Bewcastle and made Thomas his depute as Captain of Bewcastle.[2]