What is a person who audits called?

A person who audits is called an auditor, which is the standard professional title across accounting, finance, government, and quality management fields. An auditor is someone trained to examine records, accounts, operations, or compliance with rules to verify accuracy and detect errors or fraud. There are many specialized types of auditors, an IRS auditor or revenue agent audits individual and business tax returns for the Internal Revenue Service, a certified public accountant or CPA performs independent audits of company financial statements for investors, an internal auditor is employed by a company to review internal controls and risk management, an external auditor works for an independent firm to provide objective assurance, a forensic auditor investigates financial crimes and fraud, a compliance auditor checks whether laws and regulations are followed, and a quality auditor inspects manufacturing processes against ISO standards. In informal contexts you might also hear examiner, inspector, or reviewer used to describe someone performing an audit function. The plural is auditors, and the act they perform is called auditing, which requires objectivity, attention to detail, and knowledge of accounting standards and laws.