Washington Grays Monument, also known as the Pennsylvania Volunteer, is a bronze statue by John A. Wilson. The monument represents the Washington Grays who served in the 17th, 21st and 49th Pennsylvania Militia during the American Civil War. In 1925, almost 20 years after the sculpture was made, renowned sculptor and art historian Lorado Taft wrote, "No American sculpture has surpassed the compelling power which John A. Wilson put into his steady, motionless 'Pennsylvania Volunteer'." Joseph Wilson built the base of the monument which was unveiled on April 19, 1872. Over 35 years later John Wilson sculpted the bronze statue, which was dedicated on April 18, 1908 at Washington Square, and rededicated June 14, 1991 at its present location in front of the Union League of Philadelphia, 140 South Broad Street, in Center City, Philadelphia, Pennsylvania. The sculpture is positioned adjacent to the sculpture 1st Regiment Infantry National Guard of Philadelphia.

John Albert Wilson was a Canadian sculptor who produced public art for commissions throughout North America. He was a professor in the School of Architecture at Harvard University for 32 years. He is most famous for his American Civil War Monuments: the statue on the Confederate Student Memorial on the campus of the University of North Carolina, Chapel Hill, and the Washington Grays Monument in Philadelphia.