Nicarchus or Nicarch (Greek, Modern (1453-);: Nίκαρχoς) was one of the generals of the Seleucid king Antiochus III the Great (223 - 187 BC). He served in Coele-Syria in the war between Antiochus and Ptolemy Philopator (221 - 203 BC). Together with Theodotus he superintended the siege of Rabbatamana, and with the same general headed the phalanx at the battle of Raphia in 217 BC.