Ontario Knife Company (OKC) was an American knife manufacturer founded in 1889 in Naples, New York. The company relocated to Franklinville, New York, in 1902, where it operated for over a century . OKC was renowned for producing durable knives and tools for military, tactical, and outdoor use.

In August 2023, OKC was acquired by Blue Ridge Knives and subsequently ceased operations . Despite this, their products remain sought after by collectors and enthusiasts