- ACNN stands for Australian Conference on Neural Networks
- ACNN stands for Association of Child Neurology Nurses
- ACNN stands for Australian College of Neonatal Nurses (est. 1992)
- ACNN stands for Autosport Competitie Noord Nederland (Dutch: Northern Netherlands Autosport Competition)
- ACNN stands for Age Concern Nottingham and Nottinghamshire (UK)
ACNN