"Party Favor" is a song by American singer Billie Eilish from her debut studio EP, Don't Smile at Me (2017).

"Party Favor" was released on a pink 7-inch vinyl as the seventh and final single from Don't Smile at Me on April 21, 2018, coinciding with Record Store Day for that year, along with a cover of "Hotline Bling", written by Canadian rapper Drake, as the B-side, by Darkroom and Interscope Records.

[4] "Party Favor" was written by Eilish and Finneas O'Connell, her brother and the track's sole producer and mixer.

"[8][3] Sam Moore of NME described the genre of Eilish's cover of "Hotline Bling" as "delicate indie pop" compared to the original version.

[8] Spruch commented that "Party Favor" can "be easily overlooked when standing next to early hits 'Bellyache' and 'Ocean Eyes'," but that it "still has a whole lot of that Eilish persona.