| image=FileM198 brush.jpg|250px
| name=M198 Howitzer
| affiliation=Hazardous Environment Combat Unit
| type=WikipediaArtillery|Towed artillery piece
| ammotype=155 mm shell
| operation=Button on the back
| rate of fire=Slow
| projectile speed=
| usedby=Gordon Freeman
| entity=N/A (the cannon itself is named "func_tankmortar")
| designer=Karen Laurhttp//www.norsecode.com/klaur/hl/default.htm ''Half-Life'' section on Karen Laur's official website (textures)
The '''M198 Howitzer''' is a medium-sized, towed artillery piece used by the HECU around the surface of the Black Mesa Research Facility.
The M198 is a powerful artillery piece. It can kill any enemy in one shot, but has a long cool down between shots. It is never seen being used by enemies, but it can be used by the player.
In ''Half-Life'', the M198 appears twice in the chapter ''Surface Tension''. In both appearances, Gordon Freeman|Gordon uses it to destroy a shutter blocking the way.
While the M198 is very powerful, it has a very slow rate of fire. If an enemy appears ready to fire while the gun is still in its cooldown phase, it is advised to deal with the enemy with other weapons while the gun is still cooling down, then resume with the M198.
==List of appearances==
CategoryWeaponsCategoryHECU weaponsCategoryHalf-LifeCategoryBrush entities