The network announced the interview will air on a "20/20" special on April 15. The interview will be conducted by "ABC News" anchor George Stephanopoulous.
The network's announcement, which came during its airing of the Academy Awards, declared "nothing's off limits."
The show will air two days before Comey's book "A Higher Loyalty" is released.
Comey was fired by President Donald Trump last May. Trump initially cited Comey's handling of the probe into Democratic rival Hillary Clinton's emails. He later told NBC's Lester Holt that he was thinking of "this Russia thing."
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