ATHENS—The leader from Greece’s ultra-rightist Golden Dawn party was released from jail on Friday, as his 18-month pretrial detention period expired. He will, however, still face trial.

Nikos Michaloliakos, 57, as well as party lawmaker Yiannis Lagos, were released from a prison in Athens on Friday afternoon. Mr. Michaloliakos’ deputy Christos Pappas is also due to be released by the end of the month.

The...