"Flinch" is a song recorded by Canadian singer-songwriter Alanis Morissette for her fifth studio album, Under Rug Swept (2002). The song, written, arranged and produced by Morissette herself, is inspired by an old flame she previously dated when she was younger. Lyrically, "Flinch" is about feeling ashamed and embarrassed after seeing an ex-boyfriend, and how much he still affects her, with the protagonist claiming that she will eventually grow up and won't even flinch at his name.

The song was released in Brazil as the album's third single, after being onto the soundtrack of the Brazilian soap opera "Desejos de Mulher" in 2002. Critics were divided with the song; some praised its lyrics and Morissette's vocal performance, but others felt it was not as good as her other ballads. The song charted on Brazil's Hot 100 chart, reaching the top-forty. Morissette has performed the song live numerous times, including on her "Toward Our Union Mended Tour" (2002) and her "Live at Montreux 2012 CD/DVD".

"Flinch" was all written, arranged and produced by Alanis Morissette. According to herself, "I went to Toronto to write and I didn't know whether I'd be writing songs for the record alone or with someone. I had no idea, but I started writing alone, and within the first week I'd written seven songs. So it was all really fast and accelerated [...] I'd have my little space station worked out where it was like a keyboard, an acoustic, an electric, my journal and a microphone set up, and we'd record it all onto DAT." "Flinch" was written in the key of A major, with a moderately slow tempo of 72 beats per minute. Morissette's vocal range span from the low-note of A4 to the high-note of B5.

Morissette said she wrote "Flinch" immediately after an experience she had in Canada during which she nearly ran into the subject of the song, only eluding them by driving away. According to her, she was surprised that in spite of years after their last meeting (which was when she was "very, very young"), she was "responding to the situation as though [she] had been spending time with him two minutes earlier." "How long can a girl be haunted by you?", she sings in one part.

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