"Believe" is a song recorded by Canadian singer Shawn Mendes for Descendants, the soundtrack to the self-titled Disney Channel original movie. It was released to iTunes via Walt Disney Records on June 26, 2015 as a promotional single from the album. It is composed in the key of C major and Shawn's vocals span 2 octaves – from G3 to C5. The song received a nomination for Choice Music: Song from a Movie in the 2015 Teen Choice Awards.

The music video, released on 26 June 2015, featured appearances by Dove Cameron and Sofia Carson. It was directed by Jake Kasdan.

Shawn Peter Raul Mendes (born August 8, 1998) is a Canadian singer and songwriter. He attracted a following in 2013, when he began posting song covers on the video sharing application Vine. The following year, he caught the attention of artist managers Andrew Gertler and Island Records A&R Ziggy Chareton, which led to him signing a deal with the record label. Mendes went on to release an EP and his debut studio album Handwritten, whose single "Stitches" reached the top 10 in the US and Canada, and number one in the UK. His sophomore album, Illuminate (2016), was preceded by the single "Treat You Better". Both albums debuted atop the US Billboard 200.