Florin Cezar Ouatu is a Romanian opera countertenor, singer and pianist, sometimes known by the stage nicknames Cezar The Voice or simply Cezar.

Son of the late flautist and former teacher at Mozarteum University of Salzburg, Florin Ouatu, he was born into a family of musicians in Ploieşti. He began playing piano at six years of age. He graduated from the Carmen Sylva School of Arts in his hometown and the Milan Conservatory. In Italy, Cezar graduated the bel canto classical singing section with maximum marks. He has also studied Baroque music.

In 2001, Ouatu was accepted to the Giuseppe Verdi Music Academy in Milan, and graduated in 2004. In the 2003 International Singing Contest Francisco Viñas, he won the "Best Countertenor" prize. Cezar made his professional opera stage debut in 2007 at La Fenice, Venice. He has since appeared in further opera performances in Baroque opera roles.

Ouatu released his first pop-opera single "Cinema Paradiso" on Christmas Eve 2012. In May 2013, Cezar represented Romania in the Eurovision Song Contest 2013 in Malmö with the song It's My Life, finishing in 13th place at the end of the contest. A week later, on 25 May 2013, he performed alongside Andrea Bocelli and Angela Gheorghiu at Bocelli's concert in Romania at the Romexpo, which led to a collaboration with Vangelis.

In 2018, he auditioned for the 15th season of The X Factor UK. He was eliminated in the six-chair challenge, giving up his seat to female singer Janice Robinson.

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