Lynn Shelton was an American filmmaker, known for writing, directing, and producing such films as Humpday and Your Sister's Sister. She was associated with the mumblecore genre.

Mumblecore is a subgenre of independent film characterized by naturalistic acting and dialogue, low budgets, an emphasis on dialogue over plot, and a focus on the personal relationships of young adults. Filmmakers associated with the genre include Andrew Bujalski, Lynn Shelton, the Duplass brothers Mark and Jay, Greta Gerwig, Aaron Katz, Joe Swanberg, and Ry Russo-Young. In many cases, though, these directors reject the term. The genre is a mostly American phenomenon. The related term mumblegore has been used for films mixing the mumblecore and horror genres.