Muciṟi (Tamil: [musiri]), (Malayalam: [mutːʃiri]),, commonly anglicized as Muziris (Ancient Greek: Μουζιρίς, Old Tamil: Mucciṟi or Mucciṟippaṭṭaṇam, possibly identical with the medieval Muyiṟikkōṭŭ), was an ancient harbour and urban centre on India's Malabar Coast. It was the major ancient port city of the Chera dynasty of Ancient Tamilakam.
The exact location of the ancient city has been a matter of dispute among historians and archaeologists. Earlier it was believed to be in the region around Mangalore in the state of Karnataka; then later in Kodungallur in the state of Kerala. Excavations since 2004 at Pattanam, near Kodungallur in Kerala, have led some experts to favour that location.