"Lights Out" is a song by English hard rock band Royal Blood. Written by band members Mike Kerr and Ben Thatcher with Bass Drum of Death frontman John Barrett, it was produced by Jolyon Thomas with Kerr and Thatcher and featured on the band's 2017 second studio album How Did We Get So Dark?. The song was released as the first single from the album on 14 April 2017, reaching number 96 on the UK Singles Chart and topping the UK Rock & Metal Singles Chart.

Royal Blood wrote "Lights Out" whilst on tour in the United States with support act Bass Drum of Death, who Mike Kerr described as "really good friends of ours". After the two bands had been sharing ideas, Bass Drum of Death's frontman John Barrett co-wrote "Lights Out", with Kerr crediting him as "a big part of that tune coming together". The track was released as the first single from the band's upcoming second album How Did We Get So Dark? on 13 April 2017. The band performed the song live for the first time on Jimmy Kimmel Live! on 9 May 2017, alongside the 2014 single "Figure It Out". Chad Childers of the website Loudwire praised the performance, highlighting frontman Mike Kerr's "muscular groove" and noting that drummer Ben Thatcher "took the spotlight a bit during a mid-song breakdown".

The music video for "Lights Out" was also released on 13 April. Directed by The Sacred Egg and produced by Tom Birmingham and Natalie Arnett of Riff Raff Films, it features the band "performing the song in an empty room that slowly fills with water", after which "a horde of bodies burst out of invisible pools on the floor, ceiling and walls ... the room is cast in a deep red light and Thatcher and Kerr continue to play in the waist high water as dancers move around them", according to Rolling Stone writer Jon Blistein.

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