Natalia Marisa Oreiro Iglesias (Spanish pronunciation: [naˈtalja oˈɾejɾo]; born 19 May 1977) is a Uruguayan actress, singer, songwriter, model, television presenter and fashion designer. She began her career in telenovelas but since 2008 she has switched to work primarily in films. Oreiro has worked on social awareness shows and events for organizations like Greenpeace and UNICEF, the latter of which designated her as ambassador for Argentina and Uruguay in September 2011.

Her starring role as Milagros Espósito on Muñeca Brava (1998–99) gave her wide international fame, especially in Central and Eastern European, Central Asia and former Soviet countries, where her popularity remained even after the end of the telenovela, which has been broadcast on several occasions. She has also made several tours and special performances in these regions. The term "Oreiromania" was adopted to describe the frenzy of her fans. She has been included in Esquire magazine's "The Sexiest Woman Alive" list.

Her most recognized works in cinema are the films I'm Gilda (Gilda, no me arrepiento de este amor), Super Crazy (Re Loca), and the shortlisted for the Oscar Clandestine Childhood (Infancia Clandestina) and The German Doctor (Wakolda). As an actress she has participated in some of the most important film festivals, such as Cannes, San Sebastian, and Venice, winning many awards for her performances including 3 Silver Condor Awards and a Platino Award.

As a singer, she has sold over 10 million records worldwide and has been nominated for the MTV Video Music Awards and the Latin Grammy Awards among others. Likewise, she has also dabbled in television hosting, presenting reality series such as Got Talent Uruguay, La Voz Uruguay and ¿Quién es la Máscara? Argentina.