"Party Favor" (stylized in all lowercase) is a song by American singer Billie Eilish from her debut EP Don't Smile at Me. It was written by Eilish and her brother Finneas O'Connell, O'Connell also produced the song. "Party Favor" was certified gold in Canada and the United States.

"Party Favor" (stylized in all lowercase) is a song by American singer Billie Eilish from her debut EP Don't Smile at Me. It was written by Eilish and her brother Finneas O'Connell, O'Connell also produced the song. "Party Favor" was certified gold in Canada and the United States. The song was first released on Eilish's debut EP Don't Smile at Me on August 11, 2017 An acoustic version of "Party Favor" was released as a single on the exclusive pink 7-inch vinyl on Record Store Day in April of 2018, along with a cover of Drake's song, "Hotline Bling" as the B-side.