Codorus Forge and Furnace Historic District, also known as Hellem (Hellam) Forge, is a historic iron forge and national historic district located at Hellam Township in York County, Pennsylvania. The district includes four contributing buildings, one contributing site, and one contributing structure. The contributing buildings are the iron furnace (c. 1836), charcoal house (c. 1836), ruins of works' houses (c. 1836), ironmaster's house and furnace office (c. 1780), privy, forge (1800), and ruins of unknown structures. The furnace measures approximately 30 feet square at the base and 12 feet high. The ironmaster's house is a 2 1/2-story, stuccoed stone building, nine bays wide and one room deep. The Hellem (Hellam) Forge was first established in 1765.

It was listed on the National Register of Historic Places in 1991.

The Codorus Furnace is currently owned and maintained by the Conservation Society of York County. The organization is conducting a campaign to restore and reinforce the structure, as well as the nearby charcoal house foundation. In 2023 and 2024, an Eagle Scout project by a Scout from Dover, PA was completed which added steps and safety railings that added accessibility to the trails behind the furnace, which lead to the charcoal house and into the Susquehanna Riverlands State Park.