"TKO" is a song recorded by American singer-songwriter Justin Timberlake for his fourth studio album, The 20/20 Experience – 2 of 2 (2013). It was written and produced by Timberlake, Timothy "Timbaland" Mosley and Jerome "J-Roc" Harmon, with additional writing from James Fauntleroy and a sample of Barry White's "Somebody's Gonna off the Man". The song was distributed on September 20, 2013 by RCA Records, as the second single from The 20/20 Experience – 2 of 2. A remix of the track by rappers J. Cole, ASAP Rocky and Pusha T, known as the "Black Friday Remix", was also released. The lyrics use boxing metaphors to explain how somebody being knocked out feels to them when they see their ex out with another guy.

"TKO" entered the top 40 on the US Billboard Hot 100, where it reached number 36. The song was eventually certified Gold by Music Canada. The seven-minute official accompanying music video was released in October 2013, and stars Elvis Presley's granddaughter Riley Keough as Timberlake's love interest.

"TKO" was written and produced by Justin Timberlake, Timbaland and Jerome "J-Roc" Harmon, with James Fauntleroy also serving as co-writer of the track. The song samples Barry White's "Somebody's Gonna Off the Man". Jerome Harmon performed as keyboardist, while Elliot Ives played the guitar. Justin Timberlake handled production and arrangement of his vocals, which were recorded at Larrabee Studios in North Hollywood. The track was engineered by Chris Godbey, and mixed by Jimmy Douglass, Godbey and Timberlake at Larabee Studios, with assistance from Alejandro Baima, The song contains heavy drums and "scratchy" studio effects, which according to a staff writer of Consequence of Sound, is reminiscent of a "slightly more refined Justified." For Jocelyn Vena of MTV News, "Timberlake wasn't lying when he said that this album would be 'more dangerous' than part 1 of the 20/20 Experience, as evidenced by 'TKO,' writing that, "The track is a Timberlake/Timbaland joint, with signature bleepy production and dark undertones, a far cry from the album's lead single, upbeat throwback jam 'Take Back the Night'."

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