 On 4 April 1944 he was appointed Apostolic Administrator of Belluno e Feltre and Titular Bishop of "Lydda" by Pope Pius XII.Bortignon received his episcopal consecration from Cardinal Adeodato Giovanni Piazza, OCD, on the following 14 May.He later replaced Giosuè Cattarossi as Bishop of Belluno e Feltre on 9 September 1945.