YM

YM or Ym may refer to:
*Yngwie J. Malmsteen, Swedish Guitarist
*YM (magazine), an American teen magazine
*The IATA code for Montenegro Airlines
*The Youth Meeting program of CISV
*Yottametre, a unit for length or distance
*YM (selective medium), a combination of yeast and mold, a selective medium
*Yarmouth Mariners, a Maritime Junior A Hockey League team
*Yahoo Messenger, an instant messaging application, also Y!M or y!m
*In Finnish, ym. is an abbreviation for "ynnä muuta" which means roughly the same as "and the others".
*.ym, the Atari ST/Amstrad CPC YM2149 sound chip format
*The US Navy Hull classification symbol for a self-propelled dredge