Tacen (pronounced [ˈtaːtsən]; in older sources also Tacenj,[2] German: Tazen[2]) is a formerly independent settlement in the northwest part of the capital Ljubljana in central Slovenia.

[1] Tacen is a clustered settlement at the foot of Mount Saint Mary (Slovene: Šmarna gora) on the left bank of the Sava River, opposite the former village of Brod.

The hamlet of Na Grškem lies immediately above the Sava, Sige is to the west along the road to Vikrče, and V Bregu (or Breg) lies up the slope of Mount Saint Mary along Breg Creek (Slovene: Bregarski graben), which is a tributary of the Sava.

One possibility is derivation from Slovene *tac 'tax, tribute', referring to a settlement that had some role in collecting or paying taxes.

During the Middle Ages, adjacent Grmada Hill served as a place for bonfires to warn of Ottoman attacks.

[1] A government trade route passing through Tacen was established in 1541, conferring on the settlement the right to collect duties for crossing the Sava.

After the Second World War the manor was confiscated and converted into a police training school[1][6] using forced labor by Catholic priests held as political prisoners.