The Association of Correctors of the Press (ACP) was a longstanding trade union representing proofreaders in the United Kingdom.

The union was founded in 1854 as the London Association of Correctors of the Press.

By 1903, it was able to appoint a full-time general secretary, and selected S. F. Crampin.

[1] The union long had demarcation disputes with the London Society of Compositors (LSC); the ACP argued that proofreading was a profession which required the completion of an apprenticeship and the passing of examinations which it set, while the LSC believed that proofreading was a skill which compositors could learn through informal experience.

Only in 1952 did the unions finally reach a formal agreement on their jurisdictions.