"Heat Waves" is a song by English indie rock band Glass Animals released as a single from their third studio album Dreamland on 29 June 2020.

[9] In March 2021, the podcast Song Exploder featured an interview with Dave Bayley that specifically discussed the creation of "Heat Waves".

[11] NME's Hannah Mylrea categorized the song as "earnest R&B run through the Glass Animals filter", and Pitchfork's Ian Cohen argued its guitars "could be plucked from any number of 'wavy hip-hop' sample packs meant to emulate Frank Ocean's 'Ivy' on a bedroom producer's budget".

[16] "Heat Waves" was met with positive reviews upon release, with music critics such as Robin Murray, Owen Richards, and Rob Waters praising the song as a "stunningly effective" pop track, "built on a delicious groove and utilising very conventional lyrical structures" while containing enough elements unique to Glass Animals to entice more listeners to them.

[17][18][19] No Ripcord's Ethan Gordon generally found Dreamland "as momentarily annoying as it is infinitely forgettable" due to its combination of trap percussion and synthesizers being mostly "strained and unpleasant"; however, he considered "Heat Waves" to be the "strongest" mixture of those sounds.

It was voted into first place on the Australian Triple J Hottest 100 of 2020, making Glass Animals the first British act to top the countdown since Mumford & Sons won the 2009 poll with "Little Lion Man".

In the United States, "Heat Waves" peaked at number one on the Billboard Hot 100 chart dated 12 March 2022, completing a record-breaking 59-week climb to the position.

"Heat Waves" previously reached number 10 on the Hot 100 in its 42nd week on the chart, breaking the record for the longest climb to the top 10, surpassing Carrie Underwood's "Before He Cheats" (2007).

[23] The song also reached the top five in its 51st week on the chart, breaking the record previously set by Gabby Barrett's "I Hope" (2020).

[25][26] This longevity has been attributed to, among other things, a popular fan fiction[27] which shipped Dream and GeorgeNotFound, two internet personalities best known for playing Minecraft.

[34] A lyric video heavily based on vaporwave imagery was released through Glass Animals official YouTube account on 30 July 2020.