Ria Antoniou (Greek: Ρία Αντωνίου, [ˈria adoˈniu]; born 14 July 1988) is a Greek model and beauty pageant titleholder. In her career she became the winner of Miss Peloponnese 2007^[1] and of Star Hellas - Miss Earth Greece 2008,^[2] the runner-up in Sexiest Woman Alive 2008,^[1] the 2nd runner-up in Miss Model of the World 2007.^[1] She was also the "official Greek representative from Star Hellas"^[3] in Miss Earth 2008.^[3] She is also singer, actress, television personality, internet celebrity and model. She has become a sex symbol of the 2000s and 2010s.

Being half Peloponnesian, in 2007 Ria entered and won the Miss Peloponnese pageant^[1] and represented Greece in the Model of the World pageant and placed 2nd runner-up.^[1] Antoniou, after that pageant, was appointed by the Star Hellas Organization to represent Greece in Miss Earth 2008 on 9 November 2008, in Angeles City, Philippines. Antoniou posed many times for Nitro,^[4][5] Playboy,^[6][7] Esquire,^[8][9] and others. From 7 January 2012 to 17 March 2012 Ria took part (with Bobo Vieri, Alex Belli, Andrés Gil, Anna Tatangelo, Ariadna Romero and others contestants) on the 8th series^[1] of Ballando con le Stelle, the Italian version of Dancing with the Stars hosted by Milly Carlucci with Paolo Belli and his Big Band and aired by Rai 1 in the prime time of saturday, the most important time slot in the Italian television: in this talent show Ria was paired with Raimondo Todaro and they finished at the third place in the final episode.

From 24 March 2012 to 7 April 2012 Antoniou hosted with Paolo Belli and Milly Carlucci the first season of Ballando con te, a program of dance aired by Rai 1; on 8 December 2012 Ria was the host of the 2012 edition of The Look of the Year Fashion Awards with Nino Graziano Luca.^[10] Ria in April 2016 recited, together with Massimo Boldi and Max Tortora, in the movie La coppia dei campioni, directed by Giulio Base.^[11] Antoniou in September 2016^[12] became the new primadonna - flanked by four dancers - of the 18th edition, hosted by the comic duo Luca e Paolo, of the comedy show Colorado aired on Italia 1, the network in which Ria holds since September 2013 the role of showgirl and opinonist in the sports talk show Tiki Taka - Il calcio è il nostro gioco hosted by Pierluigi Pardo^[13] with Melissa Satta: in August 2018, Satta (as Pardo's co-host) and Antoniou as showgirl and opinionist were replaced by Wanda Nara.

Ria Antoniou in November 2016 recited as female lead^[14] in the movie Non si ruba a casa dei ladri, directed by Carlo Vanzina.^[15] Ria in August 2017 totally posed naked^[16][17][18] for the 2018 nude calendar of For Men Magazine.^[19][20] Antoniou at the end of 2017 was announced as the Sexiest Greek model for the year 2017 amongst other 143 contestants on the Greek men's magazine Kafto.^[21] During the 2017–2018 season Ria took part^[22] in the late-night variety show of Rai 2 Sbandati, hosted by the comic duo Gigi e Ross, with the role of "stable commentator" (opinionista fissa) with various people.^[23] In the summer of 2018 Antoniou was the only female^[24] commentator and showgirl^[25] in the sports talk show, hosted by Pierluigi Pardo and aired by Italia 1, Tiki Taka Russia.