"Ni Una Sola Palabra" (English: "Not A Single Word") is a song recorded by Mexican singer Paulina Rubio for her eighth studio album Ananda (2006). It was released as the lead single from the album on July 23, 2006, by Universal Music. The song was written by Xabier San Martín, keyboardist and composer from Spanish pop band La Oreja de Van Gogh, and produced by Cachorro López. It is a pop rock song with synth-pop and new wave elements.

Before its official release, the track leaked onto the internet, which prompted Rubio's team to release the song officially. "Ni Una Sola Palabra" had different release formats with a number of remixes and versions. Music critics praised the track's production, catchiness and fresh, and compared it with Rubio's first releases. It became a commercial success, peaking at number-one on the record charts of major markets, including Billboard's charts Hot Latin Songs and Latin Pop Songs. In the latter, "Ni Una Sola Palabra" became Rubio's third and final single on the Billboard Hot 100 chart. It was also included in many critic lists for Rubio's top singles and is often ranked as one of the best Latin songs of the 2000s.

Its accompanying music video, directed by Paul Boyd, portrayed Rubio as a superhero who saves her alter ego. In order to promote its parent album, Rubio performed "Ni Una Sola Palabra" at The Jay Leno Show and at the 2007 Latin Billboard Music Awards the following year, where it was won in the category of Latin Pop Airplay Song of the Year Female. Additionally, the song has been a regular staple in the set list of five of Rubio's concert tours, the first being the Amor, Luz y Sonido Tour (2007–2008).