M1, M01 or M-1 may refer to:

Arts, entertainment & media

• WD-M01 Turn A Gundam, a mecha from the anime Turn A Gundam
• M-1 (rapper), one half of hip hop duo Dead Prez
• Korg M1, a keyboard synthesizer
• Leica M1, a 1959 35 mm camera model
• Olympus OM-1, a 1972 manually operated 35mm single-lens reflex camera
• M1 (TV channel), news channel of the Hungarian MTVA
• M-1 (Lithuanian radio station)
• M1 (Ukraine), a television channel

Economics and finance

• M1 (money supply measure), in economics, a measure of the money supply
• M1 Finance, an online financial services company

Military equipment

Vehicles

US Armed Forces

• M1 Abrams, a main battle tank
• M1 armored car
• M1 Combat Car, an early tank
• M1 Light Tractor
• M1 Medium Tractor
• M1 Heavy Tractor

Other

• Bristol M.1, a 1916 British fighter aircraft
• HMS Abercrombie (1915) (M1), a WWI Royal Navy monitor
• HMS M1 (1917) (1919), an early British submarine
• HSwMS M1 [sv], a Swedish Navy mine sweeper
• HSwMS Älvsnabben (M01), a Swedish Royal Navy mine layer

Weapons

US Armed Forces

• 120 mm gun M1, an anti-aircraft gun
• 155 mm gun M1, a field artillery gun
• 20 mm aircraft gun M1 or French Hispano-Suiza HS.404
• 240 mm howitzer M1, WWII
• 37 mm gun M1, anti-aircraft
• 40 mm automatic gun M1 or Swedish Bofors 40 mm Automatic Gun L/60
• 57 mm gun M1, or British Ordnance QF 6-pounder
• 76 mm gun M1, WWII
• 8-inch gun M1, or M115 howitzer
• 90 mm gun M1, dual-purpose gun
• M1 bayonet
• M1 carbine, WWII
• M1 chemical mine, WWII
• M1 flamethrower, WWII
• M1 frangible grenade, WWII
• M1 Garand, WWII rifle
• M1 mortar
• M1 rocket launcher "Bazooka", WWII rocket launcher
• M1 Thompson submachine gun
• M1 underwater defense gun, or Underwater Defense Gun Mark 1 Mod 0

Other

• 35.5 cm Haubitze M1, a German WWII howitzer
• Benelli M1, a semi-automatic shotgun
• Guncrafter Industries M1 or Model No. 1, a handgun
• M1 (missile), French
• M1 mine

Helmets

• M1 helmet

Science and technology

• the Crab Nebula, also known as Messier object M1
• ATC code M01 Anti-inflammatory and antirheumatic products, a subgroup of the Anatomical Therapeutic Chemical Classification System

Computing

• a codename for Cyrix 6x86 processor
• M1-DA, M1, or VESA Plug and Display connector
• a part number for a 1N400x general-purpose diode
• Apple M1 system on a chip

Biology

• Primary motor cortex or M1, a symbol of the primary motor cortex in mammals in neurology
• M1 protein, a matrix protein of the influenza virus
• Muscarinic acetylcholine receptor M1, a receptor in the human autonomic nervous system
• British NVC community M1, Sphagnum auriculatum bog pool community
• 20-O-beta-D-glucopyranosyl-20(S)-protopanaxadiol, a ppd-type monoglucoside ginsenoside metabolized by intestinal bacteria
• M1 macrophage, a phenotype of macrophage

Medicine

• Slang name for methylone

Roads and railways

Railways

• Bucharest Metro Line M1, part of the Bucharest Metro, Romania
• Chesapeake and Ohio class M-1, a steam-turbine locomotive
• Line 1 (Budapest Metro), the first line of Budapest Metro, Hungary
• LNER Class M1, a class of British steam locomotives
• M-1 Rail Line, now the QLine, streetcar service in Detroit
• M1 (Copenhagen), part of the city's Metro system, Denmark
• M1 (Istanbul Metro), a light railway system in Istanbul, Turkey
• M1 (Lausanne Métro), part of the Lausanne Metro in Switzerland
• M1 (Paris Métro), the first rolling stock on the Paris Metro in 1900
• M1 (İzmir Metro)
• M1/M3 (railcar), a series of electric multiple unit cars on the Long Island Rail Road and Metro-North Railroad
• Metro M1 (Prague), metro kit M1, which is used on line C of the Prague Metro
• Milan Metro Line 1
• M1 (Warsaw), the first metro line of the Warsaw Metro
• PRR M1, a class of steam locomotive
• M series (Toronto subway), former rolling stock of the Toronto subway
• Metro North West Line (Sydney), numbered as M1.

Roads

• M1 road (Australia), different sections of the A1 highway
  • M1 (New South Wales)
  • M1 (Queensland)
  • M1 (Victoria)
• Metroad 1, a road in Sydney, Australia
• M-1 (Michigan highway), a road in the United States that runs from Detroit northwesterly to Pontiac
• M1 highway (Belarus), a road connecting the border with Poland and the border with Russia
• M1 highway (Russia), a road connecting Moscow and the border with Belarus
• M1 (East London), a Metropolitan Route in East London, South Africa
• M1 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa
• M1 (Pretoria), a Metropolitan Route in Pretoria, South Africa
• M1 (Durban), a Metropolitan Route in Durban, South Africa
• M1 (Port Elizabeth), a Metropolitan Route in Port Elizabeth, South Africa
• M1 motorway (Hungary), a road connecting Budapest and Győr
• M1 motorway (Northern Ireland), a road connecting Belfast and Dungannon
• M1 motorway (Pakistan), a 155 km (96 mi) road connecting Peshawar and Rawalpindi
• M1 motorway (Republic of Ireland), a road connecting Dublin to the border with Northern Ireland
• M1 motorway, a road in England connecting London and Leeds
• Highway M01 (Ukraine), a road connecting Kyiv and the border with Belarus
• M1 Road (Zambia)

Bus

• Route M-1 (MTA Maryland), a bus route in Baltimore, Maryland and its suburbs
• M1 (New York City bus), a New York City Bus route in Manhattan

Vehicles

• M1 category vehicle, a classification of passenger vehicles under the United Nations Economic Commission for Europe

Aviation and aerospace

• Hakuto-R Mission 1, private Japanese lunar landing mission
• M-1 (rocket engine), the largest liquid Hydrogen and LOx rocket engine ever designed
• Martin M-1, glider
• Matteson M-1, glider
• Miles M.1 Satyr, a 1930s British single-seat aerobatic biplane
• Verville-Sperry M-1 Messenger - 1922

Automobiles

• BMW M1, a German mid-engined sports car
• Great Wall Haval M1, a Chinese subcompact crossover
• Minardi M01, an Italian 1999 Formula One racing car
• Riich M1, a Chinese city car

Motorcycles

• Yamaha YZR-M1, a Japanese motorcycle

Miscellaneous

• M-1 Global or M-1 Mixfight, a mixed martial arts sports organization
• M-1 visa, a vocational training student visa for the USA
• M1 (Singaporean company), a telecommunications company in Singapore
• M1 World Championship, the first esports world championship for the mobile game Mobile Legends: Bang Bang held in 2019
• M1, a difficulty grade in mixed climbing