"Cold Water" is a song by American electronic dance music production group Major Lazer, featuring vocals from Canadian singer Justin Bieber and Danish singer MØ. The song was released on July 22, 2016, as the lead single from their debut greatest hits album, Major Lazer Essentials. It became Major Lazer's third collaboration with MØ after "Lean On" and "Lost".

"Cold Water" peaked at number one on the UK Singles Chart and number two on the US Billboard Hot 100. The song also reached number one in Australia, Austria, Belgium (Wallonia), Brazil, Canada, Finland, Ireland, Italy, the Netherlands, New Zealand, Norway, Portugal, Sweden and Switzerland; as well as the top 10 in Belgium (Flanders), Denmark, France, Germany, Greece, Iceland, Israel, Lebanon, Luxembourg, Mexico, Scotland, South Africa and Spain.

"Cold Water" was a weird one because I didn’t even know that song existed. It was a song I must have half-written somewhere at a time where I was writing a lot of songs and I did it at Benny Blanco’s house and then I got an email from Diplo just being like, "Yo! That 'Cold Water' song is dope! Can I have it?" And I was like, "I have no idea what you’re talking about," so I just didn’t reply. And then he emailed and was like, "Yo, Justin [Bieber] wants to hop on the 'Cold Water' song. Is that cool?" And I’m just like, "What are you talking about?"... And then the song came out and it was number one and I was like "Oh, that song!" I remember doing it, but it was really, really slow. I remember hearing it and being like "That kind of sounds like me. Oh wait, it was me."

The day before Diplo arrived in New York City in May 2016, he was "more than a little surprised" when Justin Bieber sent a message on Twitter about the track, "Cold Water", asking when it would be coming out. "That was not planned at all," Diplo said. According to Diplo, the song wasn't really done, when Bieber already expressed his excitement. "It's actually very real. Twitter is the only reason I know he's excited about the song. I don't have his number, so he Twitters at me," Diplo added. On May 30, Diplo announced Major Lazer's collaboration with Bieber and MØ. At the time, he did not give a specific release date, only mentioning it would be released "in a couple of weeks" and that it would premiere through Beats 1.

You can tell if something’s authentic or not… I felt like [MØ] was so ambiguous, having grown up singing pop and punk… Her word choice and her metaphors are just so foreign from American songwriters who tend to overuse the same phrases.

— Diplo's reply to a question, which said: "Why did Major Lazer ask MØ to be on the song?"

The song initially started a project, which eventually built to Major Lazer's fourth studio album's January 2017 release. "It's complicated because we just want to do it indie," described Diplo of "Cold Water." "And convincing Bieber's marketing crew to do that is hard. We don't need to have some guy tell us, 'Oh, this is what the market research says.' I'm on the ground. I see it."

I had been trying to link with Benny Blanco and Ed Sheeran for years to find the right song we could all work on together and the moment I heard this one, I knew that it was the one. The timing was perfect and when we approached Justin, he was also in love with the song we all had written. I thought it would be interesting to incorporate another vocal and seeing she's family, I reached out to MØ and we decided to try our best to make something fresh and interesting as Major Lazer.