The Sanjak of Siroz or Serres (Ottoman Turkish: Sancak-i/Liva-i Siroz; Greek: λιβάς/σαντζάκι Σερρών, Bulgarian: Серски Санджак) was a second-level Ottoman province (sanjak or liva) encompassing the region around the town of Serres (Turkish: Siroz, now in Greece) in central Macedonia. The province was dissolved when occupied by Bulgarian troops in the First Balkan War. In 1913, after the Second Balkan War, the town of Serres and the southern half of the sanjak became part of Greece.