Dm3

Dm3 may refer to:


 * Cubic decimetre ($$dm^3$$), a volume unit which is exactly equivalent to a litre
 * SJ Dm3 locomotives pulling iron ore trains in Sweden and Norway
 * DM3 density meter density measurement system for industrial in-line slurries
 * Despicable Me 3, a 2017 film
 * dm3, an instant messaging protocol