Lisa Lassek is an American film and television editor. In addition to her editing career, she has served as an associate producer on the television series Firefly. She edited episodes for the sixth season of Buffy the Vampire Slayer, served as an assistant editor for Angel, and has edited various episodes of Firefly. Lassek is a frequent collaborator of Joss Whedon, having edited his first feature-length film, Serenity, and the Marvel Cinematic Universe films  The Avengers and Avengers: Age of Ultron (which she co-edited with Jeffrey Ford). She has also collaborated with Drew Goddard, having edited his films The Cabin in the Woods and Bad Times at the El Royale.

Lassek is a native of Philadelphia, Pennsylvania and is an alumna of Vassar College and Boston University.

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