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

A midtempo pop song, "Hollow" features fluttering synths and piano as well as drum and hand-clap percussion in its instrumentation. Lyrically, the song addresses Kelly's faith and has been described as a "love song to God." It received positive response from music critics, who praised the song's uplifting message and Kelly's strong vocals. The accompanying music video for the song was released on November 5, 2015 and it shows Kelly performing the track in an abandoned house.

While promoting her debut album and after the moderate impact of previous singles, "Nobody Love" and Should've Been Us", Tori Kelly wanted to put out another single and then she heard a song called "Hollow" and it wasn’t fully finished, so she went to the studio the night that she heard it and finished the song. Later, on October 14, 2015, she announced on her Twitter account that she was going to release a new song called "Hollow" the following week. Two days later, she teased the song on her Twitter once more, with eleven seconds of the track. It was initially released to digital download in Europe on October 19, 2015, before being released in North American on October 22, 2015. An official remix featuring American hip hop artist Big Sean was released to digital retailers on October 29, 2015. Big Sean provides an additional half-sung, half-rapped verse towards the end of the song, replacing an iteration of the chorus from the solo version. "Hollow" was serviced to contemporary hit radio on November 3, 2015. It was later confirmed that the song was going to be included on the reissue of her debut album, Unbreakable Smile (2015) as its lead-single (and third overall).

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