One Time may refer to:

• "One Time" (AKA song), 2017
• "One Time" (Cherish song), 2017
• "One Time" (Justin Bieber song), 2009
• "One Time" (Migos song), 2015
• "One Time" (Nav and Don Toliver song), 2022
• "One Time", a song by King Crimson from their album Thrak, also appearing in their album/DVD Eyes Wide Open
• "Rocket Sneaker/One x Time", a song by Japanese artist Ai Otsuka
• 1time, a South African airline
• One timer, an ice hockey shot
• One time, one times, one-time, etc., an American (commonly found in hip hop music) slang term for police officers