I Know That Voice is an American documentary film about English-language voice acting. It premiered on November 6, 2013, at Grauman's Egyptian Theatre. The documentary was narrated by John DiMaggio, the voice of Bender on Futurama and Jake on Adventure Time, and stars DiMaggio and many other voice actors, including Billy West, Tara Strong, Tom Kenny, Grey DeLisle, June Foray, Rob Paulsen, Rachael MacFarlane, Mark Hamill, Ed Asner, Robin Atkin Downes, and Pamela Adlon.

The following voice actors, directors and staff were interviewed in the documentary:

DiMaggio noted that he had logged 150 interviews and over 160 hours of film.

A documentary series with the same title is being developed with segments featuring different voice actors. It was planned to be released in 2020 but it fell through. It will continue to work through the interviews from the film.

Director Lawrence Shapiro won the Certificate of Merit at the 42nd Annie Awards.