El Juramento is the title of a Spanish-language telenovela produced by the United States-based television network Telemundo. It was a limited-run series that debuted in the US on June 30, 2008. It was based on Caridad Bravo Adams's story La Mentira, previously adapted for television in 1965 and 1998. The show starred Natalia Streignard, Osvaldo Ríos, Ricardo Chávez and Dominika Paleta, and is also known as Secret Lies. BTV started to air this telenovela on November 13, 2008 in Bulgaria. Fox Televizija started to air this telenovela on January 5, 2009 in Serbia.