The National Credit Union Administration (NCUA) is an American government-backed insurer of credit unions in the United States, one of two agencies that provide deposit insurance to depositors in U.S. depository institutions, the other being the Federal Deposit Insurance Corporation, which insures commercial banks and savings institutions. The NCUA is an independent federal agency created by the United States Congress to regulate, charter, and supervise federal credit unions. With the backing of the full faith and credit of the U.S. government, the NCUA operates and manages the National Credit Union Share Insurance Fund, insuring the deposits of more than 124 million account holders in all federal credit unions and the overwhelming majority of state-chartered credit unions. Besides the Share Insurance Fund, the NCUA operates three other funds: the NCUA Operating Fund, the Central Liquidity Facility (CLF), and the Community Development Revolving Loan Fund (CDRLF). The NCUA Operating Fund, with the Share Insurance Fund, finances the agency's operations.

Credit unions in the United States served 100 million members, comprising 43.7% of the economically active population, in 2014. U.S. credit unions are not-for-profit, cooperative, tax-exempt organizations. The clients of the credit unions become partners of the financial institution and their presence focuses in certain neighborhoods because they center their services in one specific community. As of March 2020, the largest American credit union was Navy Federal Credit Union, serving U.S. Department of Defense employees, contractors, and families of servicepeople, with over $125 billion in assets and over 9.1 million members. Total credit union assets in the U.S. reached $1 trillion as of March 2012. Approximately 236,000 people were directly employed by credit unions per data derived from the 2012 National Credit Union Administration (NCUA) Credit Union Directory. As of 2019, there were 5,236 federally insured credit unions with 120.4 million members, and deposits of $1.22 trillion.