The identity of his assistants will be revealed in due course.
“Keiron is ready for this professionally and totally committed to the task ahead of him. He has been heavily involved in the success of this season and is ideally placed to carry it on for years to come,” said Saints chairman Eamonn McManus.
“He is highly respected by the players. Not only does he understand our culture, he has been instrumental in its development since the inception of Super League. Everyone at the club is totally behind his appointment and enthused by it.
“The challenge ahead is an extremely big one since the competition will be stronger next season and beyond. Keiron has the experience, ability and strength of personality to readily deal with it and will receive all of our support in so doing.
“His appointment will result in both continuity and stability within the club. We have a strong, young and exciting playing squad and are well placed to compete at the highest level for many years ahead.
“CEO Mike Rush, Keiron and myself have now worked together at the club in one form or another for fourteen years. We understand the town and the Club and their highest expectations. We will together continue to do our very best to meet them.
“The identity of his coaching assistants will separately be announced in due course.”