Zelos (/ˈziːləs/; Greek: Ζῆλος, Zēlos, literally "zeal") is the fifth single album, and the first part of the VIXX 2016 CONCEPTION trilogy, followed by Hades and Kratos, by the South Korean boy band VIXX. The album was released on April 19, 2016 under the label of Jellyfish Entertainment. The song "Dynamite" (Hangul: 다이너마이트) was used to promote the album.

On March 16, 2016 Jellyfish Entertainment revealed that VIXX would return with a new album on April 19, 2016, which was said to be more mature and powerful. With fan anticipation growing, a representative said “Whatever you’re expecting, expect more. In addition to their music, VIXX is a group that gets interest for their performance, fashion, accessories, etc. As always, we’re preparing to capture the public’s attention with this album.” On March 29, 2016, Jellyfish Entertainment released the Conception Art Film, which was said to signal the start of their year-long project and trilogy VIXX 2016 CONCEPTION, through which the group would show their wide musical and conceptual spectrum. An official Instagram for the project was also created at that time.

On April 10, 2016, VIXX released the opening trailer of 2016 CONCEPTION, and on April 12, 2015, they revealed teasers to their upcoming fifth single album, Zelos. It was also announced that the album would come in two versions, a regular version and a Kihno version. The regular version would come with the CD, 68 page photobook, photo card and poster whilst the Kihno version would come with the Kihno card, post card with printed autograph, a set of 30 photocards and a poster. On April 14, 2016, the group revealed the Zelos Concept Film, along with the release of the track list and highlight medley. On April 17, VIXX released the Official Teaser for "Dynamite". On April 18, an hour before the release VIXX went live on Naver V Live counting down to the moment Zelos was released. During the countdown VIXX shared fun and interesting stories about the album, as well as singing the title track "Dynamite" (Hangul: 다이너마이트) and ballad "Bad Bye" (Hangul: 손의이별) live. After the release of Zelos, on April 19, 2016, the title track “Dynamite” topped the digital charts at number one on Naver Music, Mnet, Bugs, and Genie while they were high on the charts for Melon, Olleh, and Soribada. The music video for "Dynamite" was released on April 20, 2016. The music video features Jellyfish Trainee and Produce 101 contestant Kim Na-young as the veiled woman.

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