YM or Ym may refer to:
- YM (magazine), an American teen magazine
- YM (selective medium), a selective growth medium which is a combination of yeast and mold
- .ym, the Atari ST/Amstrad CPC YM2149 sound chip format
- YM, the US Navy Hull classification symbol for a self-propelled dredge
- Montenegro Airlines IATA airport code
- Yahoo! Mail
- Yahoo! Mash
- Yahoo! Maps
- Yahoo! Messenger, an instant messaging application
- Yahoo! Mobile
- Yahoo! Movies
- Yahoo! Music
- Yarmouth Mariners, a Maritime Junior A Hockey League team
- Yngwie J. Malmsteen, a Swedish Guitarist
- "Ynnä muuta", a Finnish phrase meaning roughly "and the others" or "etc."
- Yokozuna Monogatari, a 1994 Japanese sumo wrestling video game
- Yottametre, a unit for length or distance
- Youth Meeting, a program of CISV International
- Young Money