AG3 may refer to:
*
AG3 battery, a common button cell battery for consumer electronics
*
Heckler & Koch G3
The Heckler & Koch G3 () is a selective fire, select-fire battle rifle chambered in 7.62×51mm NATO developed in the 1950s by the German firearms manufacturer Heckler & Koch, in collaboration with the Spanish state-owned firearms manufacturer CE ...
, a battle rifle developed in 1956 by Heckler & Koch GmbH
* ''
Artificial Girl 3'', the third installment in an adult video game series by Illusion
* Human specimen Nb.3 from
Afontova Gora
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