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