Anastasios "Sakis" Rouvas (Greek: Αναστάσιος "Σάκης" Ρουβάς, pronounced [ˈsacis ruˈvas]; born 5 January 1972), also known mononymously as Sakis, is a Greek singer, actor, and businessman.

Born in Corfu, he won medals on the U20 and U18 national athletics team during the 1980s before pursuing his musical career in 1991. Throughout the early 1990s, he was signed with PolyGram Records with whom he released five studio albums. Beginning in 1997, Rouvas signed with Minos EMI and released the charting albums Kati Apo Mena (1998) and 21os Akatallilos (2000). His Eurovision Song Contest 2004 song "Shake It" also became one of the best-selling CD singles of all time in Greece, while other songs and videos have topped the Greek music charts in the following years. Since 2010s, Rouvas expanded his career to film, television, theatre and fashion.

Rouvas has won six Arion Music Awards, 15 Pop Corn Music Awards, 26 MAD Video Music Awards (including an honorary award in 2023), four Status Man of the Year Awards, a Karolos Koun Award from the Union of Greek Theatre and Music Critics, an MTV Europe Music Award and two World Music Awards. Several number-one albums and singles which have been certified gold or higher have made him one of Greece's most popular musical artists. Known for his independence, Rouvas' musical, fashion and performance styles have influenced other artists for over three decades. In 2009 Down Town named him its "Entertainer of the Decade"; in 2010, Forbes, the only time it published a list in Greece, listed him as the third-most influential celebrity in the country and the top-ranked singer. He is often referred to as the biggest brand name in Greece; in a 2014 survey by the research company Focus Bari, his recognition reached 98%.

Since 2003, Rouvas has been in a relationship with Katia Zygouli, they married in 2017, having four children together. He has been involved in several charitable activities throughout his career, using his fame and resources to support various causes.