Trident Volcano, Stratovolcano in Katmai National Park, Alaska, US.

Trident Volcano is an eroded volcanic complex on the Alaska Peninsula in Katmai National Park, made up of up to 23 domes and reaching 6,115 feet (1,864 m) at its highest point. Its lavas are andesitic to dacitic, with zoned plagioclase, hypersthene and calcic clinopyroxene as dominant phenocrysts. The most recent major activity built a 3,599-foot (1,097 m) dome in an amphitheater on the southwest flank of the southwest peak.

The volcano was named in 1916 by researcher Robert Fiske Griggs, who led a National Geographic expedition through the region. The name comes from the three prominent peaks visible from the volcano's face.

The name Trident was given in 1916 by Robert Fiske Griggs of the National Geographic Society because three major peaks were then counted; the US Board on Geographic Names made it Mount Trident in 1928 and Trident Volcano in 1968. The Japanese sources note the mountain actually has many summits, not three.

The volcano is located in a remote national park and can typically be accessed only by plane or boat from nearby towns. Visitors should prepare for harsh weather conditions and the physical demands of traveling through undeveloped terrain.

A notable feature is the amphitheater formation on the volcano's southwest side, where a new dome grew from the ground over several decades in the middle of the 20th century. This dome represents a rare example of volcanic growth that scientists could directly observe in modern times.