The CIA Exam Review and Study Guide. Your comprehensive guide to passing the CIA exams. Certified Internal Auditor (CIA) is a designation that signifies excellence and expertise in the field of internal auditing. As the only certification for auditors that is recognized worldwide, CIA provides access to a multitude of opportunities for those who want to prove their value within their organization. CIA candidates are exposed to the information and experience that will lead them towards a successful career applying checks and balances to any organization in any industry. Earning this expert-level designation is a noteworthy accomplishment that identifies you as a leader among your peers.