The Jarvis Window was dedicated to Lieutenant William Dummer Powell Jarvis after his death in the First World War on 24 April 1915. Two years later a plaque in his honour was erected near the window. His grandfather the Honorable William Jarvis was an officer in the 1st American Regiment (or Queen's Rangers) and served in the Revolutionary War.

This Tiffany style window was made by New York Studio of Calvert and Kimberley. It depicts the Holy Ghost to the Apostles at Pentecost - 50 days after Easter and ten after the Ascension.