List of mountains on Io

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More than 135 mountains have been identified on the surface of Jupiter's moon Io.{{cite book |last=Turtle |first=Elizabeth P. |display-authors=etal |editor=Lopes, R. M. C. |editor1-link=Rosaly Lopes |editor2=Spencer, J. R. |title=Io after Galileo |date=2007 |publisher=Springer-Praxis |isbn=978-3-540-34681-4 |pages=325–330 |chapter=Appendix 2: Ionian mountains identified to date }} Despite the extensive active volcanism taking place on Io, most mountains on Io are formed through tectonic processes. These structures average {{convert|6|km|mi|abbr=on}} in height and reach a maximum of 17.5 ± 1.5 km (10.9 ± 1 mi) at South Boösaule Montes. Mountains often appear as large (the average mountain is {{convert|157|km|mi|abbr=on}} long), isolated structures with no apparent global tectonic patterns outlined, in contrast to the situation on Earth. To support the tremendous topography observed at these mountains requires rock compositions consisting mostly of silicate, as opposed to sulfur.{{cite journal |title=Stability of sulfur slopes on Io |journal=Icarus |last=Clow |first=G. D. |author2=Carr, M. H. |pages=268–279 |volume=44 |issue= 2|date=1980 |doi=10.1016/0019-1035(80)90022-6 |bibcode=1980Icar...44..268C}}

Mountains on Io (generally, structures rising above the surrounding plains) have a variety of morphologies. Plateaus are most common. These structures resemble large, flat-topped mesas with rugged surfaces. Other mountains appear to be tilted crustal blocks, with a shallow slope from the formerly flat surface and a steep slope consisting of formerly sub-surface materials uplifted by compressive stresses. Both types of mountains often have steep scarps along one or more margins. Only a handful of mountains on Io appear to have a volcanic origin. These mountains resemble small shield volcanoes, with steep slopes (6–7°) near a small, central caldera and shallow slopes along their margins.{{cite journal | last=Schenk |first=P. M. |display-authors=etal |title=Shield volcano topography and the rheology of lava flows on Io |journal=Icarus |volume=169 |pages=98–110 |date=2004 |issue=1 |doi=10.1016/j.icarus.2004.01.015 |bibcode=2004Icar..169...98S}} These volcanic mountains are often smaller than the average mountain on Io, averaging only {{convert|1|to|2|km|mi|abbr=on}} in height and {{convert|40|to|60|km|mi|abbr=on}} wide. Other shield volcanoes with much shallower slopes are inferred from the morphology of several of Io's volcanoes, where thin flows radiate out from a central patera, such as at Ra Patera.

Some of Io's mountains have received official names from the International Astronomical Union. The names are a combination of a name of a person or place derived from the Greek mythological story of Io, Dante's Inferno, or from the name of a nearby feature on Io surface and an approved descriptive term. The descriptive terms, or categories, used for these mountains depends on their morphology, which is a reflection of the mountain's age, geologic origin (volcanic or tectonic), and mass wasting processes. Mountains consisting of massifs, ridges, or isolated peaks use the descriptive term, mons or the plural montes, the Latin term for mountain. These features are named after prominent locations from the Greek mythological travels of Io or places mentioned in Dante's Inferno.{{cite web | last=Blue | first=Jennifer | date=October 16, 2006 |url=http://planetarynames.wr.usgs.gov/append6.html | title=Categories for Naming Features on Planets and Satellites | publisher=USGS | accessdate= 2010-01-17 }} Plateaus are normally given the descriptive term mensa (pl. mensae), the Latin term for mesa, though some mountains with plateau morphology use mons. Ionian mensae are named after mythological figures associated with the Io myth, characters from Dante's Inferno. Like mountains, these features can also be named after nearby volcanoes. Some units of layered plains have names using the descriptive term planum (pl. plana). However other more mountainous structures, such as Danube Planum, use the term. Partly as a result of the inconsistent use of this term, planum has not been used since the Voyager era. Ionian plana are named after locations associated with the Io myth. Rare cases of volcanic mountains, such as the shield volcano Tsũi Goab Tholus, use the term tholus (plural: tholi). Ionian tholi are named after people associated with the Io myth or nearby features on Io's surface.

See also the list of volcanic features on Io and the list of regions on Io.