Antonios "Antonis" Vlontakis (born 10 October 1975) is a retired Greek water polo player. A long-standing member of the Greece national water polo team, Vlontakis competed in the 2000 Summer Olympics (10th place), the 2004 Summer Olympics (4th place), and the 2008 Summer Olympics (7th place). He was part of the Greek national team that won the Bronze Medal in the 2005 World Championship in Montreal and the Bronze Medal in the 2004 World League in Long Beach. Vlontakis started his career at NO Chania and in 1997 he moved to Olympiacos where he had a successful career (1997–2002, 2009–2011), winning 1 LEN Champions League (2002), 5 Greek Championships (1999, 2000, 2001, 2002, 2010), 4 Greek Cups (1998, 2001, 2002, 2010) and 2 Greek Supercups (1997, 1998). He was a key player of the Olympiacos team that won the 2002 Triple Crown (LEN Champions League, Greek Championship, Greek Cup).