1. Dante’s Peak - Arguably the best Volcano movie out there. You have Pierce Brosnan as a volcanologist who teams up with the towns mayor played by Linda Hamilton to save a town from an erupting volcano. Released in 1997 during the peak of Disaster movies it might not be the best disaster movies but it is the best one about a volcano.
2. Volcano - Unfortunately Volcano came out the same year as Dante's Peak and paled in comparison. This one has Tommy Lee Jones as head of the emergency management department in Los Angeles. The movie is not as bad as some might remember it but the idea of a volcano in LA still seems kind of silly.
3. Joe Versus the Volcano - One of Tom Hanks lesser known movies. The movie didn't do well when it was first released but has since grown in cult status.
4. 2012 - This one is a bit of a stretch. The movie is about the end of the world but there is a big section about Yellowstone National Park erupting. It also features Woody Harrelson as a conspiracy theorist radio talk show host.
5. Supervolcano - Speaking of an erupting Yellowstone National Park Supervolcano is an entire movie about that. The movie is told documentary style about scientists who are studying the Yellowstone Caldera when it suddenly erupts. The movie was made for TV and was shown on the Discovery Channel. A cross between actually learning and disaster movie it actually is a fairly decent movie. It is now playing on Netflix if you feel like checking it out.