"No" is a song by American singer and songwriter Meghan Trainor, recorded for her second major-label studio album, Thank You (2016). It was written by Trainor, Eric Frederic, and Jacob Kasher Hindlin, and produced by Ricky Reed. The track was released on March 4, 2016, as the lead single from the album.

Backed by an instrumental of ripping guitars, the dance-pop and R&B song draws some influences from doo-wop, with lyrics about men who "can't take the hint" when their advances towards women are rejected. Its composition was compared by several critics to various pop artists of the late 1990s and early 2000s, such as Britney Spears and NSYNC. It debuted at number 21 on Radio Songs, becoming the highest debut on the chart since Lady Gaga's "Born This Way". The song peaked at number three on the US Billboard Hot 100, and was nominated for Choice Music Single: Female at the 2016 Teen Choice Awards.

The accompanying music video for the song was set at a warehouse. The video was noted to be visually darker than Trainor's previous clips and features her dancing alongside an all-female dance troupe. The clip drew comparisons to the works of Spears and Madonna for its sexual nature.

In an interview with Fuse's Jason Lipshutz, Trainor stated the song is "a big anthem for ladies about telling a dude, 'Nah, I'm good—I’m out here on my own, and I'm good with it.'" She also said, "The scene is me in a club, and the dude comes up to me and I go, 'No no no. I don't need your hands all over me. I'm good. I'm gonna dance on my own with my girls.'"Billboard gave a preview of the lyrics: "My name is 'no'/My number is 'no.'" Musically, she described the material as "something that's not on the radio" and "different." Trainor wanted "No" to resemble the Britney Spears song "Overprotected", as well as the music of NSYNC and Destiny's Child. Referring to the meeting, Trainor revealed that label director L.A. Reid had told the singer she then lacked a proper lead single for her upcoming album: "he said I have an album of Nice Meghan." Trainor said it took little time to craft the song with producer Ricky Reed, explaining: "I told my producer we needed a big eff-you song, an anthem about girl power that sounded like nothing on the album. We wrote it that day." She added: "I was too scared to go by myself [play the final result for Reid]. L.A. played it 29 times--and we kept counting. I’ll never forget that moment." Ultimately, the song changed the direction of its parent album, as they started experimenting with new musical styles and produced six more tracks.

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