The Mega Shark film series is made up of four monster and disaster films from The Asylum, an American independent film company and distributor that focuses on producing low-budget films.^[1] The movies in the series are:

• Mega Shark Versus Giant Octopus (2009), directed by Ace Hannah (a pseudonym for Jack Perez); starring Deborah Gibson and Lorenzo Lamas
• Mega Shark Versus Crocosaurus (2010), directed by Christopher Douglas-Olen Ray; starring Jaleel White, Gary Stretch, and Robert Picardo
• Mega Shark Versus Mecha Shark (2014), directed by Emile Edwin Smith; starring Christopher Judge and Elisabeth Röhm
• Mega Shark Versus Kolossus (2015), directed by Douglas-Olen Ray; Illeana Douglas, Amy Rider, and Brody Hutzler

The third film was direct to video; the others received limited theatrical releases.

The Mega Shark, Giant Octopus, and Crocosaurus all appear in The Asylum's 2022 film 2025 Armageddon, which celebrates the studio's twenty-fifth anniversary. In this film, they are created and sent to attack Earth by a hostile alien race that believes The Asylum's films are based on real creatures.^[2] To battle them, humanity creates several Mecha Sharks. Kolossus also makes a brief cameo through footage from Mega Shark Versus Kolossus.

• List of killer shark films