Mohasin may refer to:

People

• Lev Mosin (1992–), a Russian sprinter
• Maksim Mosin (1982–), a Russian professional football player
• Sergei Ivanovich Mosin (1849–1902), a Russian military officer, engineer, and a designer of the Mosin–Nagant rifle
• Vasily Mosin, (1972–), a Russian sport shooter who specializes in the double trap

Other

• The Mosin language, spoken in Vanua Lava Island in Vanuatu
• The Mosin–Nagant, a rifle developed by the Imperial Russian Army in 1882–91

• The 7.62 Tkiv 85, a Finnish modification of the Mosin–Nagant to be a designated marksman/sniper rifle
• The Karabinek wz. 91/98/23, a Polish modification of the Mosin–Nagant to carbine form