Sharknado 3: Oh Hell No! is a 2015 American made-for-television science fiction action comedy disaster film and the third installment in the Sharknado film series, following Sharknado and Sharknado 2: The Second One. The film was directed by Anthony C. Ferrante with Ian Ziering, Tara Reid, Cassie Scerbo, and Mark McGrath reprising their roles from the previous installments. Also joining the cast are David Hasselhoff, Bo Derek, Ryan Newman (replacing Aubrey Peeples in the role of Claudia Shepard, from the first film), and Jack Griffo.

Irish music duo Jedward wrote and performed the film's official theme song "Oh Hell No", and also had a brief cameo in the film. In the film, Fin Shepard and his allies attempt to stop a group of sharknadoes that emerge along the East Coast of the United States, from Washington, D.C., to Florida.

The film premiered on Syfy in the United States on July 22, 2015.

The fourth film, Sharknado: The 4th Awakens, was released on July 31, 2016.