"Boss" (stylized as "BO$$") is a song recorded by American girl group Fifth Harmony. It was written by Eric Frederic, Joe Spargur, Daniel Kyriakides, Gamal "LunchMoney" Lewis, Jacob Kasher and Taylor Parks, and was produced by Ricky Reed, Joe London and Daylight. It was released on July 7, 2014 as the lead single from their debut studio album Reflection (2015). Lyrically, "Boss" is a female empowerment song.

The song peaked at number 43 on the US Billboard Hot 100, number 37 on the US Mainstream Top 40 chart and number 75 on the Canadian Hot 100. It reached the top 40 in countries like Spain and the United Kingdom. The song was certified platinum by the Recording Industry Association of America.

An accompanying music video for the song, choreographed and directed by Fatima Robinson, was released on the band's Vevo page that showed the group performing with chairs and interacting at a photo shoot and an arm wrestling contest.

On May 30, 2014, Fifth Harmony played a teaser snippet of the track near the end of their performance at the Kiss 108 FM Concert in Boston. The song was later confirmed for their debut album, set to be released in fall 2014.

Speaking to MTV, Fifth Harmony stated that "the whole point of this song is for girls who are our age to turn it on and feel confident and empowered because at this age being insecure is such a common occurrence. So I think when you turn that song on, you feel sexy and feel good about yourself." On the Today Show where the girl group performed the single live for the first time in its entirety. After the performance they said; "We feel like so many people are competitive with one another and we want to bring everyone together and have people encourage one another. That's what it's all about".

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