A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds", resulting in "a fully conjugated cyclic dione structure". The class includes some heterocyclic compounds.

Quinonez or Quiñónez may refer to:

• Alex Quiñónez (born 1989), Ecuadorian sprinter
• Alfonso Quiñónez Molina (1874–1950), President of El Salvador 1918–1919 and 1923–1927
• Carlos Andrés Quiñónez (born 1980), Ecuadorian footballer
• Carlos Quiñónez (born 1977), Guatemalan football midfielder
• Crispiniano Quiñones Quiñones (died 2000), Colombian Army General
• Denise Quiñones (born 1980), the fourth Puerto Rican winner of the Miss Universe contest
• Domingo Quiñones, singer of salsa music
• Eleuterio Quiñones, recurring fictional character in Puerto Rican radio and television
• Eloise Quiñones Keber, Professor of Art History at Baruch College and the CUNY Graduate Center
• Francis Quiñones (1482–1540), Spanish cardinal
• Francisco de Quiñónez, Spanish soldier who was appointed as governor of Chile (May 1599 – June 1600)
• Francisco Mariano Quiñones (1830–1908), proponent of the abolition of slavery and self-determination for Puerto Rico
• Hólger Quiñónez (born 1962), retired soccer defender from Ecuador
• Jackson Quiñónez (born 1980), Spanish hurdler of Afro-Ecuadorian descent
• John Quiñones, ABC News correspondent
• John Quiñones (politician) (born 1965), the first Republican of Puerto Rican ancestry elected to the Florida House of Representatives
• José Luis Quiñónez (born 1984), Ecuadorian footballer
• José María Gil-Robles y Quiñones (1898–1980), Spanish politician in the period leading up to the Spanish Civil War
• José Quiñones Gonzáles (1914–1941), Peruvian military aviator and national aviation hero
• José Severo Quiñones, the first Chief Justice of the Supreme Court of Puerto Rico
• Juan Gómez-Quiñones, American historian, professor of history, poet, and activist
• Juan Quiñónez (born 1987), Peruvian footballer
• Lee Quiñones (born 1960), American graffiti artist
• Luciano Quiñones (born 1948), pianist and composer of Modern Puerto Rican Danzas
• Luis Quiñones (born 1962), former utility infielder in Major League Baseball
• Marc Quiñones, American percussionist, a player in salsa music, and a member of The Allman Brothers Band
• Marcelo Quiñones (born 1949), former boxer from Peru
• Michael Quiñónez (born 1984), Ecuadorian football attacking midfielder
• Oscar Quiñones (born 1941), Peruvian chess master
• Óscar Quiñones (1919–1987), Peruvian artist
• Passo Honroso (1409–1458), Leonese knight and author
• Pedro Quiñónez (born 1986), Ecuadorian footballer
• Rafael Quiñones Vidal (1892–1988), journalist; radio and TV Master of Ceremonies
• Ray Quiñones (born 1958), retired Puerto Rican long jumper
• Rey Quiñones (born 1963), Puerto Rican baseball infielder
• Samuel R. Quiñones, the fifth President of the Senate of Puerto Rico, from 1949 to 1968
• Victor Quiñones (born 1960), the founder and owner of International Wrestling Association