"No" is a song recorded by singer-songwriter Meghan Trainor for her second major-label studio album, Thank You (2016). The song 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 influences from doo-wop and pop, 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 Jive Records artists of the early 2000s, namely Britney Spears and NSYNC.

Critical response to "No" was positive: critics found the musical direction new for Trainor and a noticeable departure from her previous work. It reached number 11 on the US Billboard Hot 100, becoming her fifth consecutive top-15 song, and the highest debut on the Radio Songs chart since Lady Gaga's "Born This Way".

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 saw her join a female dance troupe. For its sexual nature, the clip garnered comparisons to the works of Spears and Madonna.