Hogg Rock is a tuya volcano and lava dome in the Cascade Range of northern Oregon, United States, located close to Santiam Pass.

Hogg Rock lies south of Three Fingered Jack and north of Hayrick Butte, a somewhat larger tuya of similar age and composition.

It is a historic landmark, with the remnants of Colonel T. Egenton Hogg's Oregon Pacific Railroad, the Santiam Lodge, and a quarry.

[1] It is close to Santiam Pass, by the Hayrick Butte tuya, another feature produced from the interaction of volcanic eruptive materials with glaciers.

[1] The Oregon Department of Fish and Wildlife determined in the early 1990s that there was potential for peregrine falcon nests at Hogg Rock, though it was considered low-quality habitat because of its lack of suitable ledges and high amounts of human disturbance.

)[12] Hogg Rock shows more similarity to the basaltic andesite deposits at North Sister, which are poorly enriched in incompatible elements.

[13] The part of the High Cascades that extends south from Mount Jefferson to Santiam Pass includes shield volcanoes, lava domes, and cinder cones.

[13] Part of a mostly mafic chain of volcanoes between the Three Sisters and Mount Jefferson, Hogg Rock has magma with an intermediate composition.

[9] Andesite forming Hogg Rock has an aphyric,[9][20] only slightly porphyritic texture, with plagioclase, orthopyroxene, and olivine phenocrysts.

[17] Santiam Pass has been assessed for its geothermal energy potential, and there is a drill corehole extending to a depth of 3,040 feet (930 m) south of the highway area.

The dating for these samples cannot be confirmed because of the close proximity of Brunhes-aged dikes, which likely heated nearby rock and caused the loss of radiogenic argon.

[27] Also known as the Corvallis and Eastern Railroad,[28] it was built by Chinese and Italian workers[29] to connect Newport and Boise,[28] though in actuality it only extended to Idanha.

Hogg Rock can be reached from a snowshoe trail that starts at the Santiam Pass Sno-Park, which has restrooms and a snow play area for children.