M311

M311 or M-311 may refer to:


 * M-311 (Michigan highway)
 * Alenia Aermacchi M-311, a turbofan-powered military trainer
 * EML Wambola (M311), a Lindau-class minehunter of the Estonian Navy
 * The CQ M-311, a variant of the Norinco CQ rifle
 * The M-311 compass invented by Tuomas Vohlonen