Lesnik (Greek: Λεσνηκ) was a fortified town in medieval Serbia (Rascia), registered by Byzantine Emperor Constantine Porphyrogenitus, under the rule of Časlav Klonimirović.^[1]

Serbia consisted of the following fortifications (καστρα, 'castle'): Destinikon (Δεστινίκον), Černavusk (Τςερναωουσκεή), Međurečje (Μεγυρέτονς), Dresneik (Δρεσνεηκ), Lesnik (Λεσνηκ), Salines (Σαληνέζ), in the Zhupa of Bosnia (Βοσνωνα): Katera (Κατερα) and Desnik (Δέσνηκ)."De Administrando Imperio by Constantine VII^[1]

The location is unknown,^[2] but has been connected with:

• The toponym Lješnica
  • in Derventa, Bosnia and Herzegovina
  • in Tuzla, Bosnia and Herzegovina
  • in Kučevo, Serbia
• The toponym Lešnica
  • in Loznica, Serbia^[3]
  • in Podujevo, Kosovo
• The toponym Lesnica
  • in Trgovište, Serbia