"Heartbeat" is a song by Spanish recording artist Enrique Iglesias. The song was written by Iglesias, along with his long-term collaborators Jamie Scott and Mark Taylor, for his ninth studio album Euphoria (2010). The mid-tempo ballad, produced by Taylor, features guest vocals from American recording artist Nicole Scherzinger. The song has a melody based on futuristic piano sounds and incorporates elements of dance music. The Rudi Wells' Open Heart Remix of the song later appeared on Scherzinger's debut studio album Killer Love (2011).

The song was released as the album's third overall single, though it is the second English-language single, on 8 June 2010 in the United States and later in October 2010 France and the United Kingdom. Critics praised the song for the way that Iglesias and Scherzinger's voices complimented each other. An accompanying music video features the pair in emotive mood-lit scenes, where digitally produced colored heartbeats react as they interact with each and the lyrics of the song. Another version of the song titled as "Heartbeat (India Mix)" featuring Indian singer Sunidhi Chauhan was included on a Special Indian Edition of Euphoria.

"Heartbeat" is a mid-tempo dance ballad featuring a melody lead by futuristic piano notes. It was written by Iglesias, Jamie Scott and Mark Taylor, who also produced the song.Stephen Thomas Erlewine of Allmusic pointed out that the song had an "icy texture" while Becky Bain of 'Idolator' noted that the duo's vocals carry lots of emotion. It also contains elements of electropop. "Heartbeat" was also featured on Nicole Scherzinger's debut album, Killer Love (2011). The version featured on the album is the "Rudi Well's Open Heart Remix". Ellwood noted that the remix "added beats changing the tone of the song completely." and changed the song from dance, to more electronic rock and electro-industrial tendencies.

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