Janko Mitrović (Serbian Cyrillic: Јанко Митровић; 1613–1659) was a harambaša (Ottoman for "bandit leader"), and the commander of the Morlach army, in the service of the Republic of Venice, from 1648 until his death in 1659.

He participated in the Cretan War (1645–69), alongside Ilija Smiljanić, as the supreme commanders of the Venetian Morlach troops, of which he is enumerated in Croatian and Serb epic poetry (as Janko of Kotari, Јанко од Котара).

Janko was the son of Mitar (born c. 1585[1]), whose family hailed from village Zelengrad or Žegar in the area of Bukovica.

[1] Stojan, who was Janko's eldest son, began fighting alongside him and Ilija Smiljanić early on, in the Cretan War (1645–69).

Under his command were people of Ražanac, Vinjerac, Ljubač, Posedarje, Novigrad, Krmpoćani, as well controlled two cols at Old Obrovac[1] In February 1659, near the Cetina river, both leaders Janko and Ilija Smiljanić succumb to wounds after battling the Turks.