Eucratides II or Eukratides II (Greek: Εὐκρατίδης Β΄) was a Greco-Bactrian king who was a successor and probably a son of Eucratides I. It seems likely that Eucratides II ruled for a relatively short time after the murder of his namesake, until he was dethroned in the dynastic civil war caused by the same murder: During his earlier years, Eucratides II may have been a co-regent of his father: on his later coins he adds the title Soter (Saviour), which could be an indication that he now ruled in his own right.