Clinton has been under FBI investigation since last year because of a private email server she used for government emails during her time as U.S. secretary of state.
One of Clinton's aides told ABC the interview lasted 3.5 hours at the agency's Washington, D.C., headquarters.
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A spokesman for her campaign said the former secretary of state was "pleased" to offer her comments to investigators but that she wouldn't say anything else about the interview.
Several outlets posted scoops Friday, reporting an interview would take place soon.
Since the investigation began last year, several of Clinton's former aides and confidants have been interviewed, but this is the first time the presumptive Democratic presidential nominee has been interviewed.
A Justice Department source told ABC it wants to wrap up the investigation and offer its recommendations before the Democratic National Convention kicks off July 25.
Attorney General Loretta Lynch said Friday that she plans to follow those recommendations.
This video includes clips from U.S. Department of Justice, CNN, The White House and Hillary for President and images from Lee Cannon / CC BY SA 2.0 and Aude / CC BY SA 3.0.
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