Louis Mandylor was born in Melbourne, Victoria, Australia, the son of Greek immigrants from the Peloponnese, Louise (née Mandylaris) from Kalamata and Yannis Theodosopoulos from Tripoli, a taxi driver. He is the younger brother of fellow actor Costas Mandylor. He and his brother took a shorter version of their mother's last name citing their last name as being too long. He played for Heidelberg United FC (Megas Alexandros) in their 1988 State League championship team. He also played five National League games in 1989 and scored many goals one famous stretch of goals (in 1988-1989) which elevated the greek team back into the premier league of that era.. During his soccer career, he was boxing in Melbourne winning 14 fights with 4 losses, he then emigrated to the United States to originally pursue a Boxing career and then subsequently an Acting career. Mandylor is probably most famous for his role in the movie My Big Fat Greek Wedding (2002); he reprised his role in its spin-off TV series My Big Fat Greek Life (2003) and the movie sequel My Big Fat Greek Wedding 2 (2016). He has enjoyed success in US television shows, such as a prominent guest appearance on Relic Hunter with Tia Carrere. Other major roles include playing Louis Malone in Martial Law alongside Sammo Hung. However, the show only lasted two seasons, with Mandylor being dropped at the end of its first season. Mandylor appeared in the sitcom Friends, pretending to be Joey's twin in "The One With Unagi". He appeared twice on CSI: Miami; in the third season (2004) as a robber/killer, and in a different role in the eighth season (2009). He and his brother Costas have acted alongside each other in the Charmed episode "Saving Private Leo" (2002), the crime thriller Sinners and Saints (2010) and "My Brother Cicero" (1998), a short movie which Louis wrote and produced. Louis portrayed Deputy Lloyd in the Syfy thriller film The Cursed; he stars alongside his brother Costas. One of his more popular roles was that of Bobby DeLuca in the film Suckers (2001), where he plays a good-guy turned car salesman.

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