View source for M21

'''M21''' or '''M-21''' may refer to:

==Transportation==
* [[M21 (New York City bus)]], a New York City Bus route in Manhattan
* [[M-21 (Michigan highway)]], a road connecting Flint and Grand Rapids
* [[M21 (East London)]], a Metropolitan Route in East London, South Africa
* [[M21 (Pretoria)]], a Metropolitan Route in Pretoria, South Africa
* [[M21 (Durban)]], a Metropolitan Route in Durban, South Africa
* [[Highway M21 (Ukraine)]]

==Military==
* HMS ''M21'', Royal Navy [[M15 class monitor]]; sunk in 1918
* [[M21 mine]], an American circular anti-tank landmine
* [[M21 Sniper Weapon System]], a sniper rifle based on the M14 rifle
* [[Zastava M21]], a Serbian assault rifle
* [[Lockheed M-21]], a variant of the [[Lockheed A-12]] and the carrier aircraft for the [[Lockheed D-21]]
* [[M21 mortar motor carriage ]], a half-track carrying an 81 mm mortar

==Other==
* [[BMW M21]], a 1983 2.4 L diesel straight-6 engine
* [[MSrE M-21]], Hungarian aerobatics aircraft
* [[Lockheed M-21]], an American reconnaissance drone carrier aircraft
* [[MacGregor 21]], an American sailboat design
* [[Messier 21]], an open star cluster in the constellation Sagittarius
* [[Proton Putra]], car model sold in Australia as Proton M21
* [[M postcode area]], M21 [[Chorlton-cum-Hardy]], [[Firswood]] area of Manchester

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