thumb|300 px|Mongibello Mons and other topographic features on Io's leading hemisphere

More than 135 mountains have been identified on the surface of Jupiter's moon Io. Despite the extensive active volcanism taking place on Io, most mountains on Io are formed through tectonic processes. These structures average in height and reach a maximum of 17.5 ± 1.5 km (10.9 ± 1 mi) at South Boösaule Montes.

Mountains on Io (generally, structures rising above the surrounding plains) have a variety of morphologies. Plateaus are most common. These volcanic mountains are often smaller than the average mountain on Io, averaging only in height and 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. 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. Coordinates and Length come from the USGS website that hosts that nomenclature list. Height information from Paul Schenk's 2001 paper, "The mountains of Io: Global and geological perspectives from Voyager and Galileo". When the name refers to multiple mountains, the tallest peak from Schenk et al. 2001 is listed. Those whose heights come from another sources are noted and sourced in the table. Height ranges result from uncertainties due to different methods used to determine the height of the mountain.

{| class="wikitable"

! Mountain !! Named after !! Coordinates !! Length !! Height

|-

| Antenora Mons || Antenora || || 122.00 km ||

|-

| Apis Tholus || Apis (Greek) || || 145.71 km || N/A

|-

| Argos Planum || Argos || || 195.45 km || 3.2 km || 331.32 km || 4.5 km

|-

| Euboea Montes || Euboea || || 439.94 km || 10.3–13.4 km

|-

| Euxine Mons || Euxine || || 286.17 km || 7.7 km

|-

| Gish Bar Mons || Gish Bar (Babylonian) || || 110.0 km || 9.7–11.0 km

|-

| Haemus Montes || Haemus (Greek) || || 333.56 km || 10.8 km

|-

| Hermes Mensa || Hermes (Greek) || || 134.8 km || N/A

|-

| Hiiaka Montes || Hiiaka (Hawaiian) || || 406.34 km || 11.1 km