Johan Zeier Cappelen (18 December 1913 – 16 September 2007) was a Norwegian jurist and ambassador.
He was born in Vang, Hedmark, a son of Hans Blom Cappelen (1879–1965) and a brother of Andreas Zeier Cappelen.
The brothers were members of Mot Dag in the 1930s.
He served as Norwegian ambassador to Brazil from 1960, and later to Iceland and Bulgaria/Yugoslavia.
He was decorated Knight, First Class of the Order of St.
Olav in 1972, and with the Grand Cross of the Icelandic Order of the Falcon.