A computer-implemented method for migrating archived files may include (1) identifying a file system including a plurality of placeholder files that reference corresponding archived files stored on a first archival system, (2) identifying a request to migrate the archived files from the first archival system to a second archival system, (3) making the second archival system available to the file system for archival, and, while both the first archival system and the second archival system are available to the file system, (4) locating each placeholder file within the plurality of placeholder files on the file system, and, for each located placeholder file, (5) retrieving a corresponding archived file from the first archival system, and (6) archiving the corresponding archived file on the second archival system. Various other methods, systems, and computer-readable media are also disclosed.