The Financial Regulator , officially the Irish Financial Services Regulatory Authority, was the single regulator of all financial institutions in Ireland from May 2003 until October 2010 and was a "constituent part" of the Central Bank of Ireland. It was re-unified with the Central Bank of Ireland on 1 October 2010 and its board structure was replaced by a new Central Bank of Ireland Commission.

Financial regulation is a form of regulation or supervision, which subjects financial institutions to certain requirements, restrictions and guidelines, aiming to maintain the integrity of the financial system. This may be handled by either a government or non-government organization. Financial regulation has also influenced the structure of banking sectors, by decreasing borrowing costs and increasing the variety of financial products available.