A Practice Note discussing motions to correct clerical mistakes or mistakes arising from an oversight or omission under Federal Rule of Civil Procedure (FRCP) 60(a) (sometimes called motions for relief from a judgment based on clerical mistakes). This Note explains when a judgment or order may be corrected due to clerical mistakes under FRCP 60(a), what a motion to correct a clerical mistake must specify, who can move to correct a clerical mistake, when the motion must be filed, and the grounds for the motion. This Note also explains how to draft, serve, and file the motion, opposition, and any reply, and appeals after entry of an order disposing of the motion.