"Not a Bad Thing" 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. It was released as the third single from the album on February 24, 2014. The song is a mid-tempo pop ballad, that makes use of an acoustic guitar throughout, with its lyrics centering on the semantic field of love.

"Not a Bad Thing" received positive reviews, with several contemporary music critics. The song's music video premiered on the The Ellen DeGeneres Show on March 20, 2014. It is a mini documentary, that follows two documentary filmmakers searching for a couple that got engaged on January 12, 2014, while heading to New York City on the Long Island Rail Road train, with the man proposing to his girlfriend to "Not a Bad Thing". The video concludes with the filmmakers being led to several false leads, with a second part of the video to follow. Timberlake performed the song on The Tonight Show Starring Jimmy Fallon and during The 20/20 Experience World Tour. The song reached number 8 on the US Billboard Hot 100 and topped the Mainstream Top 40.

"Not a Bad Thing" was written by Timberlake, Timothy "Timbaland" Mosley, Jerome "J-Roc" Harmon, and James Fauntleroy. The song was produced by Timbaland, Timberlake, and Harmon. Timberlake arranged and produced his vocals, which were recorded at Larabee Studios in North Hollywood, California. Harmon provided keyboards for the song, while Elliot Ives and Timberlake played the guitar. The track was engineered by Chris Godbey, and mixed by Jimmy Douglass, Godbey and Timberlake, with assistance from Alejandro Baima, at Larabee Studios.

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