Jacinto Francisco Fernández de Quincoces y López de Arbina (17 July 1905 – 10 May 1997) was a Spanish football player and manager, as well as President of the Valencian Pilota Federation. He was a central defender and is regarded as one of the greatest defenders of the inter-war era.

He played 25 matches for the Spain national football team from 1928 to 1936.^[1] He was part of Spain's team at the 1928 Summer Olympics,^[2] and was part of Spain's 1934 FIFA World Cup team. He was Spain's national coach in 1945, taking charge for two matches.^[3]

His brother Juan had a short career with Alavés, during which the siblings were teammates.^[4] His nephew Juan Carlos Díaz Quincoces was also a professional footballer and a Spanish international, usually referred to as 'Quincoces' in recognition of his famous relative (conventionally the paternal surname Díaz would have been used). They worked together at Valencia as coach and player in two spells.^[5]

• Deportivo Alavés – 1920–1931
• Real Madrid – 1931–1936, 1939–1942 (hiatus due to Spanish Civil War)

• Real Zaragoza – 1942–1943, 1956–1958
• Spain national football team – 1945
• Real Madrid – 1945–1946, 1947–1948
• Valencia CF – 1948–1954, 1958–1960
• Atlético Madrid – 1954–1955^[6]

Since Quincoces was a Basque pelota pala player before becoming a football professional, when his career finished, he was chosen by the Francoist authorities as President of the Valencian Pilota Federation, believing that Basque and Valencian handball sports were the same. Quincoces declared to the press several times that he was unwilling to undertake this task, but while he was in charge (late 1960s and early 70s) he promoted new measures that resulted in profit for Valencian pilota, such as the beginning of the Youth Championships, compulsory for the trinquets that wanted to host professional tournaments, this was the way pilotaris such as Genovés I and Xatet de Carlet began.