The term EM3 may refer to :
- Exploration Mission-3 (EM-3), former name of Artemis 3, a planned mission for NASA's Artemis program
- Echo Meter EM3, a handheld active bat detector manufactured by US company Wildlife Acoustics
- e-M3, a test electric vehicle developed by Croatian company Rimac Automobili
- EM-3, a proposed experimental British assault rifle, a precursor of the EM-2 rifle
- EM3, or Electrician's Mate 3rd Class, an enlisted rate in the US Navy and US Coast Guard
- EM3, a category for streaming pupils formerly used in education in Singapore
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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