William Sutherland Maxwell RCA (November 14, 1874 – March 25, 1952) was a well-known Canadian architect and a Hand of the Cause in the Baháʼí Faith.

In 1898 he returned to his brother Edward's office for fifteen months, after which he spent a year and a half in Paris, where he was accepted as a student in the atelier of Jean-Louis Pascal at the École des Beaux-Arts, under whom Despradelles had also studied.

The Maxwells would frequently visit the Baháʼí World Centre in Haifa, Palestine (current day Israel).

While in Haifa he designed the arcade and superstructure of the Shrine of the Báb, one of the holiest places for members of the Baháʼí Faith.

For this work and for his long devotion to the Baháʼí Faith he was recognized as a Hand of the Cause of God by Shoghi Effendi in December 1951.