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Dennis is a given name that can refer to:

• Dennis, a member of Dudley Dursley's gang
• Dennis Aldermaston, a Ravenclaw student at Hogwarts in the 1990s
• Dennis Bishop, a child who lived at Wool's Orphanage
• Dennis Creevey, a Gryffindor student at Hogwarts in the 1990s and younger brother to Colin Creevey