.32 in caliber variations include:
- .32 ACP (Automatic Colt Pistol), a pistol cartridge
- .32-40 Ballard, an American rifle cartridge
- .32 H&R Magnum, a rimmed cartridge designed for use in revolvers
- .32 Long Colt, an American centerfire fire revolver cartridge
- .32 NAA, a cartridge/firearm system from North American Arms and Corbon Ammunition using a .380 ACP case
- .32 Remington, an American rifle cartridge
- .32 rimfire cartridge, chambered in revolvers and rifles in the late 19th and early 20th centuries
- .32 S&W, cartridge was introduced in 1878 for the Smith & Wesson model 1½ revolver
- .32 S&W Long, a straight-walled, centerfire, rimmed handgun cartridge, based on the earlier .32 S&W cartridge
- .32-20 Winchester, the first small-game lever-action cartridge that Winchester produced
- .32 Winchester Self-Loading, an American rifle cartridge
- .32 Winchester Special, a rimmed cartridge created in October 1901 for use in the Winchester Model 94 lever-action rifle
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