YM, Ym, or ym may refer to:
Arts and entertainment YM (magazine), an American teen magazine Yngwie J. Malmsteen, Swedish guitarist
Businesses and organizations Dow Jones Industrial Average (futures symbol YM) Montenegro Airlines (IATA airport code YM) Yang Ming Marine Transport Corporation, a Taiwanese shipping company, that prefixes its ships' names with YM Yarmouth Mariners, a Maritime Junior A Hockey League team Yield management, a variable pricing strategy based on understanding consumer behavior in order to maximize profits Young Marines, an American youth organization that promotes a drug-free lifestyle Young Muslims (disambiguation), one of several Muslim youth organizations Youth Meeting, a program of CISV International
Science and technology .ym, the Atari ST/Amstrad CPC YM2149 sound chip format YM (selective medium), a selective growth medium which is a combination of yeast and mold Yoctomolar (yM), a unit of molar concentration Yoctometre (ym), a unit of length or distance Yottametre (Ym), a unit of length or distance
Other uses Yam (god), Ugaritic deity of the sea Dredge, self propelled (YM), a US Navy hull classification symbol "Ynnä muuta", a Finnish phrase meaning roughly "and the others" or "etc."