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Aleksandar "Aca" Nikolić (Serbian Cyrillic: Александар "Аца" Николић; 28 October 1924 – 12 March 2000) was a Serbian professional basketball player and coach. He was also a professor at the University of Belgrade's Faculty of Sport and Physical Education. He is often referred to as the Father of Yugoslav and Serbian Basketball.
Though his parents lived in Brčko, Nikolić was born in Sarajevo, Kingdom of Serbs, Croats and Slovenes, due to his pregnant mother, Krista, suddenly going into labour while visiting her sister in Sarajevo. Young Aleksandar enjoyed a privileged upbringing courtesy of his wealthy father, Đorđe Nikolić, who had him at the age of 62. After spending the first few years of his life in Brčko, Nikolić moved with his family to the capital Belgrade, where he would grow up.
Nikolić attended the Kralj Aleksandar Gymnasium at the Belgrade neighbourhood of Banovo Brdo. He then studied medicine and law at the University of Belgrade, graduating in 1946.