Macs
- ChIP-Seq
- MACS (software)
- MAKS (disambiguation)
- MAssive Cluster Survey
- Mac (disambiguation)
- Mac's Convenience Stores
- Macintosh
- Macks Creek, Missouri
- Macs (disambiguation)
- Macx (disambiguation)
- Magellanic Catalogue of Stars
- Magnetic-activated cell sorting
- Manual Ability Classification System
- Max (disambiguation)
- Metropolitan Area Commuter System
- Minimal Access Cranial Suspension
- Mountain Ash Comprehensive School
- Multi-purpose Arcade Combat Simulator
- Multicenter AIDS Cohort Study