John B. DeValles (1879–1920) was a Catholic priest who founded the first Portuguese parochial school at Espirito Santo Church in Fall River, Massachusetts, and later served with distinction as a U.S. Army chaplain during World War I. Accounts of his ministry to both Allied and German soldiers were published, and he received honors from both the French and United States government before his death in 1920 of complications from his wartime wounds.