1/6 (Korean: 6분의1; also written as and pronounced One Sixth) is the third extended play by South Korean singer Sunmi. It was released by Abyss Company on August 6, 2021. It is the singer's first Korean EP in nearly three years, following Warning (2018). The singer's third extended play features six songs including the lead single, "You Can't Sit with Us".

The visual concept of 1/6 is a throwback to the early 2000s. The EP deals with the profound inner emotions such as anger, confusion, sadness and happiness that "we can't help but go through in the gravity of our lives." The mini album is primarily a retro-styled pop record that combines synthwave, dance-pop, bubblegum pop and city pop elements.