Dionis is an given name and a surname derived from Dionysus. Notable people with the name include:
Given name
- Dionis Bubani (1926–2006), Albanian writer, playwright, humorist and translator
- Dionis de Lys, Flemish conquistador
- Dionís Renart (1878–1946), Spanish artist
- Dionis Vodnyev (born 1971), German ski jumper
Surname
- Achille Pierre Dionis du Séjour (1734–1794), French astronomer and mathematician
- Jean Dionis du Séjour (born 1956), French politician
- Pierre Dionis, French physician