Asked in FBI
FBI
Head of FBI?
Answer

Wiki User
December 25, 2011 12:22AM
Robert S. Mueller, III
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Is it an FBI or a FBI?

It would be "an" before FBI (an FBI investigation, an FBI
agent), because FBI is pronounced "eff-bee-eye."
The indefinite article an is used whenever the following
spoken sound is a vowel sound, or is very similar to one, notably H
sounds. (The word historical is one of several words that
may use either a or an.)
When you use FBI as a noun, it is neither of the above, and
you'd say, "the FBI". The FBI is a specific government agency and
not countable. So it is "the FBI" unless you are using FBI as an
adjective, then the above rules would apply.
Examples:
John is an FBI agent.
John works for the FBI.