"Loser" is a single recorded by South Korean group Big Bang. It was released digitally on May 1, 2015 by YG Entertainment, as the first single from Made and M, marking the first music release for the band since 2012. The track was acclaimed by music critics, who admired its mature concept. "Loser" finished 2015 at number two on the Gaon Digital's year-end chart, and was awarded Song of the Year on the tradicional Golden Disc Awards.

YG Entertainment announced the title tracks of Big Bang's "MADE Series: M" in the third teaser, including two singles, "Loser" and "Bae Bae". Two of the four teasers for D-1 to D-4 consist of the song info, including who was responsible for the tracks' composition.

"Loser" is a hip-hop/R&B track with a slow tempo and emotional melody. The song was composed using common time in the key of Eb major, with a moderate tempo of 90 beats per minute. The vocals span from the lower octave of F₄ to the two-lined higher note of B♭₅.Billboard compared the song with "the previously heard brilliance in songs like 'Bad Boy,' 'Lies' and 'Blue'," and highlighted how the track "stripped away all trendy elements for a straight-forward, acoustic-leaning take on baring what lies deep in each of our consciousness." "Loser" was noted for introducing a more mature style to Big Bang as a group, without losing the images they had enforced through previous releases.

The song's lyrics were noted to be "confessional," showing that even superstars have insecurities. Standing out from other Big Bang songs for not falling in the love song category, the lyrics described feelings of doubt and unhappiness that accompany the everyday life of a self-proclaimed loser, while also detailing "unhappiness with one-night stands and forgetting the importance of love." G-Dragon explained the meaning behind the lyrical-content, saying that "people who stand under the spotlight are just human beings," saying that all humans have their feelings hurt, but also the songs adept on all the situations, saying "however, we wanted to offer a [more universal] theme with this song, so we drew a bigger picture. Somebody may not have a friend and somebody may not have love, you know? Everyone lives in a different situation. Depending on how you accept it, this song could be your story."

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