Mesudiye, formerly Hamidiye, (in Greek Μεσουδιέ and Μιλάς) is a municipality and district of Ordu Province, Turkey.

Mesudiye is a large area of hilly countryside, villages and pasture far inland from the Black Sea coast, south-west of the city of Ordu, in the direction of Sivas.

This is a low-income district that since the 1950s has seen successive generations migrate away to jobs in Istanbul and elsewhere.

Mesudiye has been inhabited since the Iron Age era and has numerous remains from the time of the Hittites and there are a number of rock tombs from early antiquity in the area.

According to Bryer and Winfield, the later Greek name for Mesudiye (or Hamidiye) was Meletios, Melet, or Milas (Grk: Μελέτιος, Μελέτ, or Μήλας), probably derived from the Melanthios River (Melet Irmak) which runs through it and down to Ordu.