Giulia Crostarosa was an Italian Roman Catholic nun who founded the Order of the Most Holy Redeemer (Redemptoristines), an order of contemplative nuns. Her founding of the Redemptoristines was the culmination of mystical visions and her devotion to the way of life they showed her. She assumed the religious name of "Maria Celeste" when she became a professed nun. She was also instrumental in encouraging Alphonsus Liguori to found the Congregation of the Most Holy Redeemer (Redemptorists), a missionary order of priests and brothers.