John Krider (1813-1886) was one of Philadelphia's most prominent gunsmiths during the nineteenth century.

Krider opened his shop, located at the corner of 2nd and Walnut streets, in 1837, and operated it for most of his career. During the Civil War, he served as sutler to the 4th Regiment of the Pennsylvania Reserve Volunteer Corps. After the war, Krider concentrated his work on breech-loading shotguns for sportsmen. He also sold other sporting goods, such as fishing tackle and sporting trophies, and engaged in taxidermy. After Krider's death in 1887, the business was carried on by John T. Siner (1821-1902). Around 1903, Leander C. Siner (1851-1942) and Charles Mohr (1867-?) assumed control as L. C. Siner & Co. and continued the business into the 1930s.