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Knife collecting is a hobby which includes seeking, locating, acquiring, organizing, cataloging, displaying, storing, and maintaining knives. Some collectors are generalists, accumulating an assortment of different knives. Others focus on a specialized area of interest, perhaps bayonets, knives from a particular factory, Bowie knives, pocketknives, or handmade custom knives.

The knives of collectors may be antiques or even marketed as collectible. Antiques are knives at least 100 years old; collectible knives are of a later vintage than antique, and may even be new. Collectors and dealers may use the word vintage to describe older collectibles. Some knives which were once everyday objects may now be collectible since almost all those once produced have been destroyed or discarded, like certain WW2 era knives made with zinc alloy handles which are rapidly degrading due to the material's shelf life. Some collectors collect only in childhood while others continue to do so throughout their lives and usually modify their collecting goals later in life.