MNF may refer to:
Music Maata Näkyvissä Festival, Finland
Chemical elements Manganese(III) fluoride, MnF2 and MnF4
Political organizations Mizo National Front, Mizoram, India Mizo National Front (Democratic), split from the Mizo National Front Mwalimu Nyerere Foundation, Tanzania
Television shows Monday Night Football, a live game telecast of the NFL on ABC and ESPN Monday Night Football (Sky Sports), televised Premier League football
Places Monongahela National Forest, West Virginia, US
Military Multinational Force in Lebanon, an international peacekeeping force created in 1982 Multi-National Force – Iraq, MRF-I