Charles Edward Drennan (born 23 August 1960 in Christchurch, New Zealand) is a former New Zealand Bishop. He was the second Bishop of Palmerston North, New Zealand, from 2012 to 2019. On 4 October 2019 he resigned his position. Two allegations of "unacceptable behaviour" of a sexual nature were made. An investigation by the Catholic Church's New Zealand Office for Professional Standards found that the behaviour was unacceptable for a Catholic bishop but not criminal in nature.