Attavyros (Greek: Αττάβυρος) or Atavyros (Ατάβυρος) or Atabyron (Ancient Greek: Ἀτάβυρον)[1] is the highest mountain on the island of Rhodes in the Dodecanese in Greece.

The lower slopes of the mountain are largely forested with Pinus brutia and Cupressus sempervirens, as well as maquis shrubland.

[2] They are also home to the peony species Paeonia clusii subsp.

[3] Ant species include Aphaenogaster balcanica, festae, and sporadis; Camponotus aegeus, aethiops, boghossiani, gestroi, kiesenwetteri, oertzenii, lateralis and samius; Colobopsis truncata; Crematogaster ionia; Lepisiota melas; Messor wasmanni; Pheidole pallidula; Plagiolepis pallescens; Temnothorax antigoni and dessyi[4] The mountain is part of a Natura 2000 special area of conservation since 2008, together with the neighbouring Mount Akramitis.

In Greek mythology Althaemenes founded an altar to Zeus Atabyrios (Ἀταβύριος Ζεύς) on the mountain.