The Institute of Internal Auditors Inc. | 197,332 followers on LinkedIn. Global Voice & Leader in Internal Audit | Empowering Professionals | About The Institute Established in 1941, The Institute of Internal Auditors (IIA) is an international professional association with global headquarters in Lake Mary, Fla., USA. The IIA is the internal audit profession's global voice, recognized authority, acknowledged leader, chief advocate, and principal educator. Members work in internal auditing, risk management, governance, internal control, information technology audit, education, and security.