Marine Attack Squadron 311 (VMA-311) was a United States Marine Corps attack squadron consisting of AV-8B Harrier (V/STOL) jets. Known as the "Tomcats", the squadron was based at Marine Corps Air Station Yuma, Arizona and prior to decommissioning fell under the command of Marine Aircraft Group 13 (MAG-13) and the 3rd Marine Aircraft Wing (3rd MAW).