McCollum Fish Weir is a historic Native American archaeological site on the Broad River near Lockhart, South Carolina. The site features a V-shaped fish trap built in the river roughly 500 to 600 feet upstream from the McCollum Mound, the nearby earthwork that gave it its name. It preserves evidence of an older fishing technology designed to channel fish into a confined area for capture. The weir is significant as a surviving example of Indigenous engineering and fishing practice, and its importance was formally recognized by its listing on the National Register of Historic Places in 1974.