Gabriel Semain Vasconcellos Mangabeira (born 31 January 1982) is a Brazilian competition swimmer who qualified for the men's 100-metre butterfly at both the 2004 Summer Olympics and the 2008 Summer Olympics. Mangabeira also won a silver medal in the 100-metre butterfly at the 2007 Pan American Games.
Mangabeira was born in Rio de Janeiro in 1982.
Mangabeira attended the University of Florida in Gainesville, Florida, where he swam for coach Gregg Troy's Florida Gators swimming and diving team in the National Collegiate Athletic Association (NCAA) competition from 2001 to 2004. As a Gator swimmer, he received eighteen All-American honors. Mangabeira graduated from the University of Florida with a bachelor's degree in food and resource economics in 2004.

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