M3A1 may refer to:
*
M3A1 Bradley, a variant of an American armored reconnaissance vehicle
*
Stuart tank
The M3 Stuart/Light Tank M3, was an American light tank of World War II. An improved version of the tank entered service as the M5 in 1942 to be supplied to British and other Commonwealth forces under lend-lease prior to the entry of the U.S. ...
, an American light tank
*
M3 Half-track, an American armored vehicle
*
M3 submachine gun, an American submachine gun
*
M3 Scout Car, an American armored car
{{Letter-NumberCombDisambig