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• O'Bannon, Pressley Neville - As a U.S. Marine Lieutenant and Mason, he placed the first 'Stars & Stripes' on foreign soil in defense of US national interests. His heroic achievement was the basis for the line in the Marine Corps hymn, "...to the shores of Tripoli."
• O'Higgins, Bernardo - the Liberator of Chile. Educated in England but returned to his country to lead them in their fight for independence form Spain.
• Olds, Ransom E. - American automobile inventor and manufacturer. Founded the Olds Motor Company which produced the Oldsmobile.
• Oppenheimer, David - Mayor of Vancouver who had the foresight to preserve and enormous tract of land for use as a park, dedicated to Lord Stanley, yet another Freemason.
• Otis, James - American Revolutionary politician and publicist. Famous for "Taxation without Representation is Tyranny"