"Iz U Down" is a song by American hip hop recording artist Kid Ink, released on December 17, 2013 as the second official single from his second studio album, My Own Lane. The song, produced by Mike DZL, features a guest appearance by American rapper Tyga. The song peaked at number 91 on the German Singles Chart.

On December 17, 2013, Kid Ink released "Iz U Down" featuring rapper Tyga as the second official single from his second studio album My Own Lane. It was then made available with the pre-order for My Own Lane on iTunes, along with the promotional singles "No Option" featuring King Los and "No Miracles" featuring Elle Varner and Machine Gun Kelly.

"Iz U Down" is a club-oriented track that details Ink and Tyga in the club flirting with attractive women that catch their eyes. Their goal for the night is to end up having a threesome with two women. The song was produced by Mike DZL, who constructed the song's instrumental with "smooth melodic elements and tough drums."

Kid Ink spoke to Complex how the collaboration came together saying, "We already had a cool relationship. We booked the same studio, so he was in the other room." Ink had been listening to the song thinking about who he wanted to have featured on the song. He then said, "Yo, Tyga’s next door. You want to run by and play it for him?" Then that same day, Tyga recorded his verse for the song and it was completed that day."

"Iz U Down" was met with generally positive reviews from music critics. Sheldon Pierce of XXL said, it "is a variant of the rap chart ready jingles supplied in such high quantity on the album with the distinct difference being its lower sonic register. Kid Ink unleashes a rather dexterous flow, and the record has a subdued appeal that you don’t fully appreciate right away." Chris Thomas of HipHopWired said, "In the opening moments, it's clear that the record has that bounce; the one and the same kind that makes the guy wearing a turtleneck in the club feel himself. Kid Ink compliments the sonics with verses that deliver a straight forward question to women: "is you down?"." David Jeffries of AllMusic called it the new standard bearer for pop-rap tracks aimed at the strip club. Jesse James of StupidDOPE called it "something infectious, smooth, and incredibly dope for our ears to devour." Brent Faulkner of Starpulse referred to the song as a "surefire hit" and one of the album's best songs. AJ of Uproxx's SmokingSection called it one of the album's standout songs.

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