Dennis (disambiguation)

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