Michael Andrew Gielen (born 2 June 1971) is a New Zealand prelate of the Roman Catholic Church.

He received his secondary education at Forest View High School, Tokoroa.

[3] He was ordained bishop at the Vodafone Event Centre, Manukau, Auckland[4] on Saturday 7 March 2020[5] in the presence of 3,000 people.

The papal bull of appointment was read, on behalf of the Apostolic Nuncio, Archbishop Novatus Rugambwa, by Monsignor Edward Karaan, Deputy Head of Mission and First Secretary at the Apostolic Nunciature in Wellington.

In 2015, he and seven seminarians of Holy Cross Seminary cycled for 33 days from Cape Reinga at the northern end of the North Island to Bluff on the southern coast of the South Island to promote vocations for the priesthood.