Eleni "Elena" Paparizou (Greek: Έλενα Παπαρίζου, born 31 January 1982), usually referred to abroad as Helena Paparizou, is a Greek-Swedish singer, songwriter and television personality. Born and raised in Sweden to Greek parents, she enrolled in various arts schools before launching a career in Sweden in 1999 as a member of the laïko (Greek folk music) and Eurodance duo Antique, who participated in the Eurovision Song Contest 2001 and afterwards became popular in Greece.

Antique disbanded in 2003 and Paparizou signed a solo recording contract with Sony Music Greece, releasing the chart-topping debut single "Anapandites Kliseis" and album Protereotita (2004), with emphasis on laïko, pop, and dance sounds, but at first had modest sales. In 2005, she represented Greece in the Eurovision Song Contest with the song "My Number One", which she won. It was the first Greek win in the contest's history and significantly transformed her career. Her album was subsequently certified double platinum by the International Federation of the Phonographic Industry of Greece. Paparizou briefly attempted a career beyond Greece with English-language material, charting in a few countries abroad. Her three subsequent albums Iparhi Logos (2006), The Game of Love (2006) and Vrisko To Logo Na Zo (2008) all peaked at number one in Greece and reached platinum sales. Her fifth studio album Giro Apo T' Oneiro (2010) was also certified platinum. Paparizou's final release before she left Sony Music, Greatest Hits & More, was released in 2011 and included "Baby It's Over", her biggest airplay hit to date.

Paparizou has been awarded three Arion Music Awards, a European Border Breakers Award, 23 MAD Video Music Awards—more than any other artist—and an MTV Europe Music Award. On 14 March 2010, Alpha TV ranked her as the 14th top-certified domestic female artist since 1960, having won seven platinum and four gold records. Paparizou was the most successful debuting female artist of the 2000s and established herself as one of the top acts of the latter half of the decade. As of 2010, she has been certified for the sales of 300,000 albums, 47,500 singles, and 30,000 digital downloads by IFPI Greece, in addition to 100,000 total record sales in Greece as part of Antique, 24,000 certified albums in Cyprus, and 80,000 singles in Sweden during her solo career. In 2010, Forbes listed Paparizou as the 21st most powerful and influential celebrity in Greece. She has more than 144 million views on YouTube—more than any other artist in the Greek music industry.