"I Want You to Know" is a song by Russian-German DJ Zedd, featuring vocals from American singer Selena Gomez from the former's second studio album, True Colors (2015). It was written by Zedd, OneRepublic's frontman Ryan Tedder, and KDrew. The song was released on February 23, 2015 as the album's lead single and debuted on American contemporary hit radio on March 3, 2015. The song received generally positive reviews from music critics. It has charted within top 20 of United States, United Kingdom, Canada, and Norway and has been certified platinum in the United States and Sweden.

"I Want You to Know" is a EDM track described as a electropop ballad written by Zedd, Ryan Tedder, and KDrew. Tedder and Zedd had previously worked together on Clarity album track "Lost at Sea". Tedder called Zedd when he had an idea of a track. Zedd and Gomez first met by accident on December 4, 2014, with Zedd stating: "Our studios are right across the street from each other, and I just went to the bathroom and ran into her at the studio." The following day, Gomez posted a picture online with Zedd although did not confirm they were working together. Describing her featuring, he said: "We recorded her vocal and I loved it, and I never tried anyone else on it[song]." Commenting on the song, Tedder said: "Zedd crushed it."

Musically, according to the sheet music published at Musicnotes.com, "I Want You to Know" is written in the key of A Minor with a tempo of 130 beats per minute. It follows a chord progression of Am-Em-F-Cadd9-C.

The song has received generally positive reviews. Nolan Feeney of Time applauded the collaboration between Zedd and Gomez saying they "make beautiful music together". He explained: "Zedd's futuristic synthesizers recall 'Break Free,' his literally-out-of-this-world collaboration with Ariana Grande, but Gomez [...] keeps the track from becoming a lifeless carbon copy." Jason Lipshutz of Billboard wrote that Gomez "finally hit her mark" with the song. "Gomez has never been known as a vocal powerhouse, but she deftly handles patently overdramatic lines [...] with the proper amount of yearning and unflappability. When that first drop does arrive about 80 seconds in, Zedd provides a swiveling party scene with a whiff of Daft Punk's maximalist disco thrown in for good measure." Writing for the same publication, Dan Hyman awarded the song two stars out of a possible five, stating that it "never finds its footing, and never rises above the cliched EDM formula it follows to a T".

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