"Hollow" is a song recorded by the American singer and songwriter Tori Kelly for the reissue of her first studio album, Unbreakable Smile (2015). It was first released to digital retailers on 19 October 2015 as the album's third official single before impacting American contemporary hit radio on 3 November 2015, and as the lead single from the reissue. Cowritten by Kelly with the singer-songwriters Hayley Warner, Zac Poor, Lindsey Jackson, and Thom Macken, the song was produced by Adam Anders and Peer Åström. "Hollow" has been certified Platinum in Kelly's home country.