McCollum and Post Silk Mill is a historic silk mill located at Nazareth, Northampton County, Pennsylvania. It was built in 1913, and is a two-story, rectangular brick industrial building measuring 51 feet, 6 inches, wide and 150 feet long. A one-story brick addition was built in 1967. In 2001, it was adapted for use as an apartment building. It housed a silk mill, and later clothing manufacturers, until its conversion. It was added to the National Register of Historic Places in 2005.