Dinis is a Portuguese surname. Notable people with the surname include:
Alfredo Dinis (1917–1945), Portuguese anti-fascist Edmund Dinis (1924–2010), American politician Fernando Dinis (born 1982), Portuguese footballer Henrique Dinis (born 1990), Portuguese footballer João Manuel Dinis (born 1979), Portuguese footballer Joaquim Dinis (born 1947), Portuguese footballer Júlio Dinis (1839–1871), Portuguese doctor