Giulio Maria Odescalchi, OSB (1612 – 28 August 1666) was an Italian Benedictine who served as the Bishop of Novara.

The latter opened Odescalchi's beatification process, titling him a Servant of God.

His siblings were Carlo, Lucrezia, Constantino, Nicola and Paolo.

He is also a relative of Carlo Odescalchi - future Servant of God.

Pope Alexander VII appointed him as the Bishop of Novara at the behest of Benedetto, who had resigned from that post.