1-2-3; 1, 2, 3; or One, Two, Three may refer to:
- 1,2,3, a band from Pittsburgh later reformed as Animal Scream
- 1-2-3, a band from Edinburgh later known as Clouds
- One, Two, Three, a 1980s electronic disco group produced by Bobby Orlando
Songs
- "1-2-3" (Len Barry song), 1965
- "1, 2, 3" (Sofía Reyes song), 2018
- "1-2-3" (The Chimes song), 1990
- "1-2-3" (Gloria Estefan and Miami Sound Machine song), 1988
- "1, 2, 3!" (Seungri song), 2018
- "1. 2. 3. ...", a 2006 song by Bela B. and Charlotte Roche from the album Bingo
- "123" (Nikki Laoye song), 2012
- "1 2 3" (Moneybagg Yo song), 2020
- "One, Two, Three" (Ch!pz song), 2005
- "One Two Three / The Matenrō Show", a 2012 song by Morning Musume
- "One, Two, Three, Go!", a 2008 song by Belanova
- "One Two Three", a 2012 song by E-girls
- "1-2-3! (Train with Me)", a song by Playahitty
- "Ichi Ni San" (Japanese for One Two Three), a song by Gen Hoshino from the single "Sun", 2015
- 123 (disambiguation)
- 1234 (disambiguation)
- 1 + 2 + 3 + 4 + ⋯
- Raz, Dwa, Trzy, Polish music band
- Raz, dwa, trzy (newspaper), Polish sports weekly
- "(Un, Dos, Tres) María", a 1995 song by Ricky Martin
- Un, dos, tres... responda otra vez, a Spanish game show