My Opposition: The Diaries of Friedrich Kellner is a 2007 documentary television film about an orphaned American who went in search of his German grandfather and discovered a secret diary written during the time of the Third Reich. The film is a production of Abella Entertainment Ltd. of Toronto, Canada, co-produced and co-directed by Arnie Zipursky and Fern Levitt, with executive co-producer Leonard Asper of CanWest Global. The film is distributed by CCI Releasing.

My Opposition is a diary secretly written by the German social democrat Friedrich Kellner (1885–1970) during World War II to describe life under Nazi Germany and to expose the propaganda and the crimes of the Nazi dictatorship. Comprising ten notebooks, it is considered by leading historians as "an important piece of historical literature." The editors of the German magazine Der Spiegel called it "an image of Nazi Germany that has never existed before in such a vivid, concise and challenging form." Kellner began his 861-page diary on September 1, 1939, and wrote his last entry on May 17, 1945.