Dm3

Dm3 may refer to:

• Cubic decimetre ($d{m}^3$), 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