'''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 (1936–2024), 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 * Renata Diniz (born 2008), Brazilian rhythmic gymnast * Fernando Diniz (born 1974), Brazilian football coach * Yohann Diniz (born 1978), French race walker
{{surname|Diniz}} Category:Portuguese-language surnames