John James Huddart (1856–1930), known usually as John J. Huddart, was a British born and trained architect who practised out of Denver, Colorado in the United States. At the end of the Nineteenth century he was one of Denver's leading architects, known for his work on public buildings and as a courthouse architect. His practice lasted from 1882 to 1930 and commissions included Charles Boettcher House in Denver, Colorado's Fort Morgan State Armory, Denver's Filbeck Building, and six of Colorado's county courthouses.