The M198 is a medium-sized, towed 155 mm artillery piece, developed for service with the United States Army and Marine Corps.

The M198 155 mm howitzer weighs less than 16,000 pounds (7,300 kg), allowing it to be dropped by parachute or transported by a CH-53E Super Stallion or CH-47 Chinook.

The gun tube can be rotated over the howitzer's trail legs to reduce its length, though this requires removal of the muzzle brake, or left in the firing position for faster deployment.

It provided field artillery fire support for all Marine Air-Ground Task Force organizations until the adoption of the M777 howitzer.

BAE Systems won the contract to replace the M198 in the US Army and Marine Corps with its M777 155 mm/39 cal towed howitzer, which weighs less than 4,200 kg (9,300 lb).