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Montes Haemus is a curving range of mountains that forms the southwestern edge of the Mare Serenitatis basin on the Moon. They form a less prominent mirror image of the Montes Apenninus range to the west, and curve up to nearly join at the northern end. The eastern edge terminates with the Promontorium Archerusia, to the northwest of the crater Plinius. This end reaches a gap where the Mare Serenitatis to the north joins the Mare Tranquillitatis to the south.
The selenographic coordinates of this range are , and the length is 560 km. The tallest peaks in this range climb as high as 2.4 km.
This range is named after Haemus Mons, an old Thracian name of the Balkan mountains. It appeared on the map of Moon due to Johannes Hevelius. But he assigned this name (in the form Mons Æmus) to an other feature – remains of the rim of crater Alexander, located on the other side of Mare Serenitatis. Later the name moved to the subject of this article. The same name, but with reversed order of words – Haemus Montes – belongs to one of mountain systems on Io.
Several rille systems lie along the eastern side of this range. The eastern end of the range forms the western terminus of a rille system designated Rimae Plinius. 100 km farther to the west the craters Menelaus and Auwers are embedded within the range, and to their northeast are the Rimae Menelaus. Where the mountain range curves up to the northwest, the cup-shaped crater Sulpicius Gallus lies nearby on the lunar mare. Just to the northwest of this crater, and paralleling the mountains, are the Rimae Sulpicius Gallus.
Several small "lakes", formed from basaltic lava, lie along the southwest face of the range. From the northwest to the southeast these are Lacus Odii, Lacus Doloris, Lacus Gaudii, and Lacus Hiemalis. The Lacus Lenitatis lies farther to the south.
- Hevelius J. (1647). Selenographia sive Lunae descriptio. Gedani: Hünefeld. pp. 226–227, 228. doi:10.3931/e-rara-238. (Æmus Mons is mentioned in the name list on p. 228)
- Whitaker E. A. (2003). Mapping and Naming the Moon: A History of Lunar Cartography and Nomenclature. Cambridge University Press. pp. 201, 209. ISBN 9780521544146.
- "Montes Haemus". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.