Diniz
Diniz is a Portuguese-language surname. It may refer to:
- Denis of Portugal (1261–1325), the sixth King of Portugal and the Algarve
 - Abilio Diniz (born 1936), Brazilian businessman, father of Pedro
 - Alex Diniz (born 1985), Brazilian cyclist
 - Gabriel Diniz (1990–2019), Brazilian singer and composer
 - Jacinto F. Diniz (1888–1949), American politician
 - Mauro Diniz (born 1952), Brazilian cavaquinist and singer
 - Paulo Diniz (1940–2022), Brazilian singer
 - Paulo Roberto Diniz Jr. (fl. 1990s–2010s), Brazilian bass guitarist
 - Pedro Diniz (born 1970), Brazilian racing driver, son of Abílio
 - Priscillo Diniz (born 1948), Brazilian golfer
 - Fernando Diniz (born 1974), Brazilian football coach
 - Yohann Diniz (born 1978), French race walker