STEM may also refer to:

• a Scanning Transmission Electron Microscope (STEM) or Scanning Transmission Electron Microscopy (STEM)
• STEM fields, Science, Technology, Engineering, and Mathematics, collectively considered core technological underpinnings of an advanced society
• Spatiotemporal Epidemiological Modeler, a free software developed by IBM

Stem may refer to:

• Plant stem, the above ground structures that have vascular tissue and that support leaves and flowers
• Word stem, the base part of a word not including inflectional morphemes
• Stem (bicycle part), connects the handlebars to the steer tube of a bicycle fork
• Stem (music), a part of a written musical note
• Crack stem, a device for smoking crack cocaine
• Stem (ship), the upright member mounted on the forward end of a vessel's keel, to which the strakes are attached
• Stem (skiing) is a technique in skiing
• "Stem", a song by Canadian musician Hayden from his 1995 album Everything I Long For
• The Stems, an Australian garage rock/power pop group from the 1980s
• Watch stem