"Hollow" is a song recorded by the American singer and songwriter Tori Kelly for the reissue of her first studio album, Unbreakable Smile (2015).

[3][4] 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" was written by Kelly with the singer-songwriters Hayley Warner, Zac Poor, Lindsey Jackson and Thom Macken, with production by Adam Anders and Peer Åström.

[1] The song begins with synthesizers and piano "fluttering" in the background, emphasizing Kelly's vocals, before building to a more bombastic production style with the inclusion of the drum and hand-clap percussion.

Robbie Daw of Idolator called it "a big pop anthem", noting, "By the time the second chorus rolls around, it’s pretty clear that the 22 year old and all involved mean business with 'Hollow'.

"[1] Christina Garibaldi of MTV News praised the fact that the song "once again shows off Tori’s impressive vocals as she smoothly navigates the heavy lyrics over a slow piano".

[12] Carolyn Menyes of Music Times was positive, noting that "Kelly's always-strong vocals are the main power behind the track, just dripping with vulnerability.

"[14] While noting that the song "sounds like an emotional entry from her diary", Scott Shetler of AXS named it "personal and universal, which should help it connect with listeners".