| Acronym | Definition |
|---|
| MSN | Microsoft Network |
| MSN | Master's of Science in Nursing |
| MSN | Mission |
| MSN | Mobile Suit (Newtype; Gundam gaming) |
| MSN | Medical Surgical Nursing |
| MSN | Messi-Suárez-Neymar (nickname for Barcelona soccer stars) |
| MSN | Make Some Noise |
| MSN | Mobile Social Network |
| MSN | Mobile Ad-Hoc and Sensor Networks (International Conference) |
| MSN | Medicare Summary Notice |
| MSN | Multiple Subscriber Number (ISDN) |
| MSN | Michigan School of Nursing |
| MSN | Middle School North (various locations) |
| MSN | Modem Serial Number |
| MSN | Multilayer Switched Network |
| MSN | Multicast Service Node |
| MSN | Manufacturing Sequence Number |
| MSN | Multiple Serial Number |
| MSN | Multiple Subscriber Number |
| MSN | Mobile Service Node |
| MSN | Multi System Network |
| MSN | Management Services Network (various locations) |
| MSN | Mahou Sensei Negima (anime) |
| MSN | Message Sequence Number |
| MSN | Mandatory Spay/Neuter |
| MSN | Museum Security Network (mailing list) |
| MSN | Martian Successor Nadesico (anime series) |
| MSN | Microsoft Service Network |
| MSN | Maquila Solidarity Network (Canada) |
| MSN | Manufacturer Serial Number |
| MSN | Military Service Number |
| MSN | Moesin (gene) |
| MSN | Mexico Solidarity Network |
| MSN | Merchant Services Network |
| MSN | Multi-Service Network |
| MSN | Multiple Special Needs |
| MSN | Medium Spiny Neurons |
| MSN | Math/Science Network (Oakland, CA) |
| MSN | Madison, WI, USA - Dane County Regional Airport (Airport Code) |
| MSN | Monitoring Cell Sequence Number |
| MSN | Most Significant Nibble |
| MSN | Multi-Service Node |
| MSN | Maine Support Network (Readfield, ME) |
| MSN | Muslim Student Network |
| MSN | Mechanical Serial Number |
| MSN | Mesoporous Silica Nanoparticle |
| MSN | Marine Safety Network |
| MSN | Modern Satellite Network |
| MSN | Memorial Service Network (National Cemetery Administration; US VA) |
| MSN | Methodist Student Network (University of South Carolina) |
| MSN | Mass Spectrometry to the N-th Power |
| MSN | Migration Storage Node |