Sidearm, side-arm or Side Arm(s) may refer to:

• Sidearm (weapon), a backup weapon
• Sidearm (baseball), a baseball throwing technique
• Sidearm, a flying disc (Frisbee) throw
• Hyper Dyne Side Arms, a 1986 arcade game
• AGM-122 Sidearm, a missile
• Side-arm flask (Büchner flask), a type of laboratory glassware