"Ocean Eyes" is the debut song by American singer Billie Eilish from her debut EP Don't Smile at Me, and the album Everything, Everything (Original Motion Picture Soundtrack). The song was written and produced by Eilish's older brother, Finneas O'Connell, and was originally written for his band. Finneas gave the song to Eilish for her dance performance after realizing the song suited her vocals. It was originally released on SoundCloud on November 18, 2015, but was later re-released commercially on November 18, 2016, as a single through Darkroom and Interscope Records.
"Ocean Eyes" received mainly positive reviews from critics, several of whom praised the music and lyrics. The song was commercially successful, reaching number 84 on the US Billboard Hot 100. It peaked within the top 60 in the record charts of several countries and peaked at number 72 on the UK Singles Chart. "Ocean Eyes" has received several certifications, including a triple-platinum certification by the Recording Industry Association of America (RIAA). To promote the song, the track was accompanied by a music video released on March 24, 2016, and was directed by Megan Thompson. A dance performance music video was also uploaded on YouTube on November 22, 2016. Eilish included the track on the setlists of her 2019 When We All Fall Asleep Tour and her 2020 Where Do We Go? World Tour.