This Sitcom Is...Not to Be Repeated is a Canadian comedy television series, which aired on The Comedy Network in 2001. Created by and starring Ed Sahely, Kathy Greenwood and Jonathan Wilson based on their stage show Not to Be Repeated, the series incorporated improvisational comedy techniques.

Each episode of the series was structured as a sitcom episode with a narrative framework, but at various points the actors would be called upon to draw lines submitted by viewers out of a hat, and incorporate them into the dialogue. Fifteen episodes of the show were produced.