The move will see former England lock Redman link up with Hill, who he played with at Bath during a successful period for the West Country club.
Hill said: "Nigel is one of the leading coaches in the English game and so we know he will be a success in this crucial role with the Warriors.
"He knows the very latest modern training techniques and developments in the international arena. For the last four or five years he has been working with our international team, he is bang up to date with the way forward and knowledge.
"Nigel is the sort of coach who is technically exceptional and he has a lot of time for individual work with players. I like coaches like that and he will really challenge all the players here and ask questions of them.
"His work ethic as a player was tireless and he is the same as a coach, he will put the work in and he demands that off the players. I want a huge work ethic next season and the players I have recruited have that and Nigel coming in will reinforce that. We will make sure that this team works harder than any other with real attention to detail.
"Nigel also has a great rapport with people. He is also a popular choice, who has worked with many of our players before in England age groups, and knows the club. He feels he has unfinished business here and by coming back he can achieve those ambitions."
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