"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 from several contemporary music critics. The song's music video premiered on 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.