Reclaimed lumber is processed wood retrieved from its original application for purposes of subsequent use. Most reclaimed lumber comes from timbers and decking rescued from old barns, factories and warehouses, although some companies use wood from less traditional structures such as boxcars, coal mines and wine barrels.

Reclaimed lumber is sold under a number of names, such as antique lumber, distressed lumber, recovered lumber, upcycled lumber, and others. It is often confused with salvage logging. Reclaimed or antique lumber is used primarily for decoration and home building, for example for siding, architectural details, cabinetry, furniture and flooring.

Using reclaimed wood can earn credits towards achieving LEED project certification. Because reclaimed wood is considered recycled content, it meets the 'materials and resources' criteria for LEED certification, and because some reclaimed lumber products are Forest Stewardship Council (FSC) certified, they can qualify for LEED credits under the 'certified wood' category.