Matajur (pronounced [mataˈjuːɾ]) is a 1,642-meter (5,387 ft) mountain in the Julian Alps on the border between Italy and Slovenia.

It is located on the border between the Soča Valley and the Italian mountainous region known as Venetian Slovenia, with views over the Adriatic Sea.

The Slovene name Matajur is derived via vowel harmony or akanye from *Motajur (< Mǫtmajur), which was borrowed from a Friulian name that developed from Romance Monte(m) maiōre(m) 'higher mountain'.

It is known as Mat'jur in the local dialect, and in Friulian as Mòntmaiôr or Mataiûr (a reborrowing from Slovene).

[citation needed] On 26 October 1917, Oberleutnant Erwin Rommel captured the mountain during the battle of Caporetto of World War I.