A loader for gun magazines. The loader includes a handle and a pair of spaced apart, outwardly extending prongs. In an embodiment, a stiffener is used to maintain alignment of prongs, and to keep the prongs from being urged apart during use. The loader is used by engaging prongs with a cartridge in the magazine, and then urging the cartridge against biasing means to create space for a cartridge to be loaded. Once space is created, the cartridge to be loaded is urged into magazine while cradled between prongs of the loader.