"Cate's Brother" is a song by British singer-songwriter Maisie Peters, released on 6 May 2022 as a stand-alone single.

Peters has stated that the song, which is about an ultimately fictional relationship with her real life close friend Cate Canning's brother, started out as a inside joke[1] amongst her friendship group after she met Cate's brother at a party and found him attractive.

An acoustic version of the song featuring Matt Maltese, known as "Cate's Brother (Matt's Version)" in reference to the titles of remastered albums by Peters' primary musical influence Taylor Swift, was released onto streaming platforms on 1 June 2022.

In the song, after being introduced to each other by Canning at the party, Peters and Cate's brother go on cinema dates, party together and make out, before Peters questions whether the relationship will work out after Cate's brother returns home to Canada due to its long-distance nature.

[3] Both compositionally and lyrically, "Cate's Brother" has been compared to "Stacy's Mom" by Fountains of Wayne,[2] "Sk8er Boi" by Avril Lavigne[1] and "Teenage Dirtbag" by Wheatus.