Breech may refer to:

  • Breeches, an item of clothing covering the body from the waist down
  • Breech, in a breech-loading weapon, is a chamber integral to the rear portion of a gun barrel that receives the shell, cartridge, or ammunition
  • Buttocks, the lower part of the human abdomen
  • The lower part of a pulley block
  • The penetration of a boiler where exhaust gases leave it