Shastina, Volcanic satellite cone in Siskiyou County, California, US

Shastina is a satellite cone on the western flank of Mount Shasta in Siskiyou County, California, the second youngest of four overlapping cones that build the Cascade Range's most voluminous stratovolcano. Its smooth-sided cone reaches 12,335 feet (3,760 m) and is truncated by a summit crater about half a mile (0.8 km) across, open to the west into Diller Canyon.

Shastina is the second youngest of the four overlapping cones that build Mount Shasta. It formed in a VEI-4 eruption around 7650 BC that also involved Shasta's summit and the Red Banks on the south flank. The French sources place its first activity at the start of the Holocene, about 10,000 years ago, and note later pyroclastic flows and lahars, with a last eruption of unknown date.

Native American tribes of the Klamath region regarded the volcanic formations of Mount Shasta and Shastina as manifestations of powerful natural forces.

The usual route is Cascade Gulch: from Hidden Valley it climbs diagonally to the Shasta-Shastina saddle, then up the eastern flank to the summit. Most climbers treat it as a side trip on the descent from Shasta; ski mountaineers climb it for descents such as Diller Canyon, the North Face and the South Face.

Three small lakes lie inside Shastina's summit crater: Clarence King Lake at 11,755 ft in the centre, Sisson Lake at 11,793 ft on the east side, and an unnamed lake above 11,960 ft on the south side of the cinder cone forming the true summit. They rarely melt free of snow before late summer and are the highest subaerial lakes in the Cascade Range, surpassed only by the subglacial lake under Mount Rainier's summit ice.