Júlio Mazzei was a Brazilian soccer coach. He is perhaps best known for bringing Pele to New York Cosmos of the North American Soccer League.
He coached the Cosmos to the NASL title with a 1–0 victory over the Seattle Sounders in Soccer Bowl '82.
He died in 2009, aged 78.
- Michael Lewis: Passing of a Legend: Prof. Mazzei, confidante of Pele, former Cosmos coach, passes away, Big Apple Soccer, May 11, 2009.
- Júlio Mazzei: Ex-Professor de Educação Física, Que fim levou?, Terceiro Tempo, (per 30/10/2016).
- Josmar F. Lopes: Julio Mazzei, the Cosmos and the Untold Story of the Man behind the Glasses, Reviews by Josmar Lopes, April 7, 2016.