This article is a list of standard proofreader's marks used to indicate and correct problems in a text. The marks may be abstract symbols, abbreviations, or (in some cases) entire spelled-out words. These are usually handwritten on the paper containing the text. These indicators are interleaved in the text or placed in margins. Different languages use different proofreading marks and sometimes publishers have their own in-house proofreading marks.

Lists of these marks can often be found in