A comptroller or controller (; also financial controller, abrv. FC) is a person who supervises accounting and financial reporting within an organization. A controller is an accountant in a business who oversees accounting and the implementation and monitoring of internal controls. In the United States, United Kingdom and Canada, a controller or financial controller is a senior position within most companies, often reporting to a Chief Financial Officer. Ireland The Comptroller and Auditor Genera… (More on Comptroller)