"Alive" is the lead single from Australian singer and songwriter Sia's seventh studio album This Is Acting (2016). It was co-written by Sia, Adele, and Tobias Jesso Jr. The song was produced by Jesse Shatkin. "Alive" was released on 25 September 2015. The song was originally intended for Adele's third studio album, 25, along with "Bird Set Free". However, since Adele decided not to use the songs, she let Sia use them for her seventh studio album. Musically, it is a midtempo synthpop song.

On 22 September 2015 Sia posted a tweet on Twitter which hinted that the single would be released on September 25. The next day she released a 15-second preview of the music video on her VEVO account. The song achieved moderate commercial success, reaching the top 40 in over 15 countries, including Spain, Belgium and France. In the UK, the song 30 on the UK Singles Chart. The song reached number 56 on the Billboard Hot 100, failing to reach the upper half of the chart. The music video for the song was released on 5 November 2015. It has received over 100 million views.

The song received generally positive reviews, with critics praising Sia's powerful, electrifying vocals. Sia has performed the song multiple times on camera, including The Ellen DeGeneres Show, Saturday Night Live, and The X Factor.

In September 2015, Sia confirmed that This Is Acting's lead single "Alive" would be released later that month and was originally written for Adele. She described that the song "was about Adele's life" and "written in Adele's perspective". She further explained to Ryan Seacrest that the song was written in a writing session with Adele for her third album 25, but was rejected at the last minute.Rihanna also rejected the tune.

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