.32 caliber is a size of ammunition, fitted to firearms with a bore diameter of 0.32 inches (8.1 mm).

• .32 rimfire, chambered in revolvers and rifles in the late 19th and early 20th centuries (1860)
• .32 Webley, a centerfire version of the .32 Rimfire (1868)
• .32 Long Colt, an American centerfire fire revolver cartridge and an improved version of the .32 Webley (1873)
• .32-20 Winchester, a rifle cartridge that found popularity in handguns as a powerful .32-caliber offering (1882)
• .32 S&W, cartridge was introduced in 1878 for the Smith & Wesson model 11⁄2 revolver (1892)
• .32 S&W Long, a straight-walled, centerfire, rimmed handgun cartridge, based on the earlier .32 S&W cartridge (1896)
• .32 ACP (Automatic Colt Pistol), a pistol cartridge (1899)
• .32 H&R Magnum, a rimmed cartridge designed for use in revolvers (1984)
• .32 NAA, a cartridge/firearm system from North American Arms and Corbon Ammunition using a .380 ACP case (1996)
• .327 Federal Magnum, a rimmed "super magnum" cartridge based on the .32 H&R Magnum with elongated case and higher pressure (2007)

• .32-20 Winchester, the first small-game lever-action cartridge that Winchester produced (1882)
• .32-40 Ballard, an American rifle cartridge (1884)
• .32 Winchester Special, a rimmed cartridge created for use in the Winchester Model 94 lever-action rifle (1901)
• .32 Winchester Self-Loading, an American rifle cartridge (1903)
• .32 Remington, an American rifle cartridge (1906)

• 8 mm caliber
• 32 (disambiguation)

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