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Stem or STEM most commonly refers to:

Stem or STEM can also refer to:

Language and writing

Word stem, part of a word responsible for its lexical meaning
- Stemming, a process in natural language processing
Stem (music), in music notation, the vertical lines directly connected to the note head
Stem (typography), the main vertical stroke of a letter
Stem, the opening of a multiple choice question

Stem (audio), a collection of audio sources mixed together to be dealt with downstream as one unit
Stem (music), a part of a written musical note
Stem mixing and mastering, a method of mixing audio material
The Stems, an Australian garage punk band
"Stem" (DJ Shadow song), 1996
"Stem" (Ringo Sheena song), 2003
"Stem", a song by Hayden from the 1995 album Everything I Long For
"Stem", a song by Static-X from the 1999 album Wisconsin Death Trip
"Die Stem van Suid-Afrika", or "Die Stem", the national anthem of South Africa during the apartheid era

Scanning transmission electron microscopy, a type of microscopy
Spatiotemporal Epidemiological Modeler, free software
Stem, part of a compound variable in the Rexx computer programming language
Stem (bicycle part), connecting the handlebars to the steerer tube of a bicycle fork
Stem (ship), the most forward part of a boat or ship's bow
Stem, part of a watch

Stem, a detail of stemware
- Stem (glass), the stem of a drinking glass
Stem (lesbian), or soft butch, who exhibits some stereotypical butch traits
Stem (skiing), a technique in skiing
Stem, North Carolina, U.S., a town
STEM.org, an American multinational education company
Stemming, a term in climbing
Upgrade (film), a 2018 film, originally released as STEM, featuring an AI chip called STEM