Udolphus is a masculine given name, a variant of Adolphus, and may refer to:
- Basil Udolphus Aylmer, 11th Baron Aylmer (1886–1977)
- Udolphus Aylmer, 7th Baron Aylmer (1814-1901)
- Udolphus Aylmer Coates (1908-2000), British town planner
- Udolphus Haron (360-392), fictional duke of Frisia
- Udolphus Wright, actor in Mixed Marriage
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