Mirage: A volcano? My employer is attracted to power. As am I. It's a weakness we both share.
Mr. Incredible: Seems a little... unstable.
Mirage: I prefer to think of it as misunderstood.
Mr. Incredible: Aren't we all?
Some people want to live not at volcano's feet, but in a volcano. Whether it's active or extinct. After all, a crater inside some big mountain is a relatively defensible location, there's plenty of free geothermal power, it looks impressive, and Everything's Cooler With Lava. Usually Supervillain Lair, but not always. Naturally predisposed to become a Collapsing Lair.
- Great Mazinger: Marquis Janus, one of the villains of the Mazinger Z sequel had an Island Base with an artificial volcano built on the center. Its eruptions could be set off and stopped at will. Often it was used to blast Great Mazinger with a rain of hot-molten rocks, debris and volcanic cinders in order to slow down its advance or hinder The Hero Tetsuya as he battled.
- Kotetsu Jeeg: Queen Himika's Home Base was inside a volcano.
- Starscream's temporary base in Transformers Cybertron is located on a volcanic island in the Pacific. Since he and his minions are giant alien robots, the heat is not an issue. Hell, Thunderblast enjoys bathing in the lava.
- In Pokémon, Blaine set up his gym inside the volcano of Cinnabar Island. Not surprisingly, he specializes in Fire-type Pokemon. Many other Fire-type-specializing Gym Leaders also set up their gyms in volcanoes or similar.
- Used interestingly in one Buck Danny story. While flying, Buck spots a smoking volcano island and flies over it, taking pictures to send to volcanologists. Which is how he discovers the volcano isn't active but used as a secret base by the bad guys, who use smoke emitters to disguise their operations.
- X-Men villain Magneto had a base hidden within a volcano near the Savage Land, which he could easily get in via his magnetic powers. He once held the All-New All-Different X-Men prisoner here, but in their escape and subsequent battle with Magneto, the base was destroyed after devices meant to keep the lava away were destroyed.
- Dr. Brainstorm and Jack of Calvin and Hobbes: The Series reside underneath Old Faithful.
- Plan 7 of 9 from Outer Space. Journalist Buster Kincaid is delighted to find that a Mad Scientist has an Elaborate Underground Base in Antarctica's Mount Terror. Turns out erupting volcanoes is part of his Evil Plan.
- Austin Powers — Dr Evil's Island Base — obviously based on Ernst Stavro Blofeld's base in You Only Live Twice.
- Disney version of 20,000 Leagues Under the Sea — Captain Nemo's island
- Spy Kids 2 (Island Base)
- In Fantômas Unleashed, Fantômas built his lair in a volcano in Italy, which he leaves in his Flying Car just as the volcano erupts.
- In You Only Live Twice, the SPECTRE base is built inside a volcano. It predictably erupts in the climax and provides the trope's image.
- Dragonriders of Pern has all "classic" Weyrs made this way (one of the rare occurrences of this trope with extinct volcanoes,) but not early or later ones.
- Evil Harry Dread, the low-budget Evil Overlord in The Last Hero, complains that other Dark Lords somehow manage to get volcano lairs even when the local geology is completely wrong for them.
- The eponymous Higher Institute of Villainous Education in the H.I.V.E. Series is one.
- Redwall has Salamandastron, the Long Patrol/Badger Lord base, built in an extinct volcano on the coast.
- The villain Moltor of Power Rangers Operation Overdrive bases his operations inside one of these, in sharp contrast to his brother Flurious, who resides inside of an icy cave lair.
- Airwolf's normal hangar is inside a long-extinct volcano. Justified because the tapering shape of the interior cavern is ideal for a concealed helipad; unless a satellite or search aircraft happened to overfly it right as Airwolf were taking off or landing it's almost totally invisible.
- Dungeons & Dragons
- Dragonlance — The biggest Minoi settlement around is Mount Nevermind. A combination of their smokepowder storage facility and one angry red dragon led to reactivation of the volcano and subsequent discovery of useable geothermal energy.
- Forgotten Realms — Firenewts live in volcanic mountains. Because they need lava pit-grade heat.
- Red dragons, being immune to fire, prefer hot lairs including volcanoes.
- Subverted in No One Lives Forever 2. It looks like this but, as it turns out, the actual lava pit inside the base would be too troublesome — so the villains use synthetic lava instead.
- MageCraft has a secret weapons lab variant. Justified as they can quickly destroy the research if things get out of hand.
- MARDEK has at least one NPC who lives in a volcano, a mad hermit who is actually the shaman of the area, driven insane from guilt.
- Mega Man's Dr. Wily had a couple, with at least two in the Mega Man Battle Network series.
- In the Super Mario Bros. series games, Bowser's castle is usually found inside a volcano.
- Dark Crater from Pokémon Mystery Dungeon: Explorers of Time/Darkness/Sky.
- Pokémon Emerald: Team Magma's headquarters is located in Mount Chimney, specifically because that's where Groudon is.
- The Elder Scrolls III: Morrowind has the Big Bad Dagoth Ur's Very Definitely Final Dungeon within Red Mountain, a massive shield volcano with an ancient Dwemer city complex built into it.
- Dr. Eggman has built a few of these, such as in Shadow the Hedgehog and Sonic Spinball.
- The second Island Base in Evil Genius is built around a volcano (the inside of which serves as your rocket silo).
- After his sudden yet inevitable betrayal, Premier Cherdenko of Command & Conquer: Red Alert 3 takes refuge in his secret volcano fortress, which comes equipped with a full suite of military production structures, Moai heads that shoot infantry, a Vacuum Imploder, and a fortified redoubt inside the volcano's caldera, just in case.
- The Dark Being's lair near the end of Lighthouse: The Dark Being. It's also polluting the area around it.
- It's hard to find a Dwarf Fortress player who hasn't built one of these at least once.
- Old Hell in Touhou: Subterranean Animism has been turned into a geothermal power complex. While the deeper magma chambers are active, the level is regulated and the main shaft is stable enough to house an elevator.
- Minions At Work as a comic about going-on in Supervillain Lairs featured volcanic lair of Doctor Coldblood time and again, with lots of jokes about its volcano nature.
- The Original Gobwin Knob in Erfworld was built on an extinct volcano.
- Dan and Mab's Furry Adventures lampshaded this with Dr. Jyrras explaining why he specifically chose an extinct volcano for his Island Base:
After all, nothing quite says "intelligent" like having 70 billion dollars of equipment next to an unstable volcano!
- To make it look active however, he filled the crater with bright orange pillows.
- Dresden Codak had Kimiko's dream, where she says who she wants to be when she grows up:
Kimiko: A robopsychologist like Susan Calvin from Asimov's Robot Series. Except [...] I'd live on an island with a volcano for power.
- One shows up in Genocide Man.
Dr. Fumiaki: Then welcome to Corvo Island. Part volcano, part laboratory ... well, pretty much just those two things.
- In the My Little Pony TV show and movie, witches lived in the Volcano of Gloom.
- The titular Superjail! is inside a volcano that's inside another volcano.
- In Defenders of the Earth, the Defenders' base, Monitor, was built inside a dormant volcano.
- The Forge from Steven Universe is a volcano lair used by Bismuth to forge the Crystal Gem's non-summon weapons and upgrade existing weapons, having made Rose's sword, upgrades to Garnet, Amethyst and Pearl's weapons and the Breaking-Point, a hand-held super-weapon created with the express purpose of shattering gems. The entrance can only be opened by Bismuth, and because Bismuth is a gem created specifically for construction and smithing, her body can withstand high temperatures and is able to touch molten-hot materials undeterred.
- During the Battle of Iwo Jima late in World War II, the Japanese garrison based on the island had built a network of caves and tunnels throughout the island, including the volcano, known as Mt. Suribachi. at the southern point of the island. The volcano itself was used as a headquarters and rallying point early in the battle, until it was taken by the US Marines storming the island 5 days into said battle.
- While not a volcano the Cheyenne Mountain Complex fits the general idea of a base within a hollowed out mountain.
- The Arecibo Radio Telescope occupies the crater of an extinct volcano in Puerto Rico.