Radomir, Mountain summit in Blagoevgrad Province, Bulgaria.

Radomir is a summit on the Bulgaria–Greece border, the highest point of the Belasica range at 2,029–2,031 m. It has a pyramidal form with very steep western and southern slopes, and is built of metamorphic rock. The ridge carries the state border, marked by boundary pyramid No. 24, and the peak is covered with subalpine grass vegetation.

The peak was named in 1942 and replaced the earlier name Kalabak to honor Bulgarian Emperor Gavril Radomir from the 11th century. This renaming reflects a connection between the mountain and medieval Bulgarian history.

The old name Kalabak survives in Petrich, where a street and the local tourist society bear it, and in Samuilovo, whose football club is also named Kalabak. The peak is included in the Bulgarian Tourist Union's "Conqueror of the 10 Mountain Champions" initiative, with stamps available at the Kongur and Lopovo huts.

Main starting points are Petrich (6 hours), Samuilovo (5 hours), and the huts Lovovo (2 hours), Kongur (3 hours), and Belasitsa (4.5 hours) on the Bulgarian side, or Mandradzhik (6 hours) in Greece. The summit is marked by border pyramid No. 24, and stamps for the BTS 'Conqueror of the 10 Mountain Peaks' initiative are available at the Kongur and Lovovo huts.

The summit is marked by border pyramid No. 24, and the state border runs along the ridge. From the top, Lake Kerkini (Butkovsko Lake) is visible, as are the Struma River and the entire Serres plain. To the east the ridge extends to Kongur Peak, and to the north the Strumeshnitsa valley and the Ograzhden mountain stand out.