William Brooke Thomas Trego (September 15, 1858 - June 24, 1909) was an American artist best known for his historical military paintings of the American Revolution and the American Civil War. He lived in Pennsylvania and Michigan.
He studied at French museums with Pennsylvania Academy of the Fine Arts alumni such Frederick Judd Waugh.
Trego painted over 200 historical and military paintings during his life. His depiction of George Armstrong Custer's charge at the Third Battle of Winchester was described by the Cleveland Press as "one of the best historical paintings of the kind that has ever been produced by an American artist."
He is the artist whose 1883 painting The March to Valley Forge was used as the box cover illustration for the game We the People and was also reproduced as a souvenir postage sheet in observance of the United States Bicentennial. His painting Rescue Of The Colors 1861 was used as the cover artwork for the board games Thunder at the Crossroads (second edition) and Bloodiest Day.