The Camillus Cutlery Company is one of the oldest knife manufacturers in the United States. The company was founded in 1876 and produced millions of knives until it filed for bankruptcy in 2007. Its brand name and intellectual property rights were purchased by Acme United Corporation, which re-launched the Camillus brand in May 2009 using modern materials.

The 14-year-old Adolph Kastor (1856–1946), is a son of a Jewish family from Wattenheim, Germany, immigrated to New York in 1870 where he started to work for his uncle Aaron Kastor in his hardware supply business, Bodenheim, Meyer & Company. He started off in charge of cow chains but gradually promoted to the firearms and cutlery department.

In 1873, Bodenheim, Meyer & Company lost one of its founders and restructured as Meyer & Kastor. Due to poor sales figures, Meyer & Kastor had to close its doors in September 1876. Only a few weeks later, Adolph Kastor started his own company, Adolph Kastor & Bros. on Canal Street in New York City, where he imported and distributed German-made knives.

In 1897, when the Dingley Tariff was enacted, the knives became too expensive to import. The only solution Kastor saw was to manufacture knives domestically. Eventually, his search led him to Charles Sherwood and his small knife manufacturing business in Camillus.

With Adolph Kastor in charge, the company started to expand. They bought new machinery, such as steam-driven drop forge hammers and fly presses and they adopted new techniques, like using alumina grinding wheels. By 1910, the Camillus Cutlery Company was producing close to a million knives a year and had about 200 employees, many of them German immigrants. The company even built a dormitory to house its German workers.

During World War I, Camillus shifted production to support the Allied forces. The company also manufactured marlinspikes, surgical scalpels, and a folding knife/spoon combination for the Red Cross in those years.

In the 1920s, the knife manufacturer introduced stainless steel to its production, and started making collectible character knives, which honoured famous people such as George Washington, Babe Ruth, and Buck Rogers. It also began manufacturing private label products for Sears, Craftsman, Woolworth and many others.

During World War II, Camillus shipped more than 13 million knives of various styles to the Allied troops. In 1942, U.S. Marine Corps officers Colonel John M. Davis and Major Howard E. America working in conjunction with cutlery technicians at Camillus developed the KA-BAR Fighting Utility Knife. After extensive trials, the KA-BAR prototype was recommended for adoption, and Camillus was awarded the first contract to produce the KA-BAR for the Marine Corps. Camillus made more KA-BARs than any other knife manufacturer producing the model during World War II. During the war, Camillus also made the M3 fighting knives, the M4 bayonets and many other utility knives for U.S. forces, including machetes, multi-blade utility knives, TL-29 Signal Corps pocket knives for signalmen, electrician's mates, and linesmen, and combination knife/marlinspike pocket knives for use by the U.S. Navy in cutting and splicing lines.