Mir Space Station, whose writing in Cyrillic letters (Мир) look like the letters MNP

Northern Mariana Islands, an archipelago in the western Pacific Ocean

Microcom Networking Protocol, an error-correcting communications protocol for modems

Mobile number portability, a service that allows one to take a cellphone number from one provider to another

MNP is a three letter acronym that can stand for several things:

Manor Park railway station, a National Rail station in England

Netherlands Environmental Assessment Agency (in Dutch:Milieu en Natuur Planbureau; MNP)

The spin trap 2-methyl-2-nitrosopropane (MNP). This diamagnetic molecule forms adducts with unstable free radicals to form a more stable paramagnetic nitroxide radical that can be detected by electron spin resonance spectroscopy. It is particularly useful for trapping carbon-centered tyrosyl radicals [eg. see J. Biol. Chem. 271 (1996), 15498-15503].