Johannes Irgens (31 July 1869 – 29 December 1939) was a Norwegian barrister, diplomat and politician, noted for his service as minister of foreign affairs of Norway from 1910 to 1913.

Once this was accomplished, he was named Chargé d'affaires under Fridtjof Nansen at Norway's embassy in London, a highly visible posting.

In 1908 he succeeded Nansen as ambassador, and in 1910 he returned to Norway to assume the post of Minister of Foreign Affairs in the Wollert Konow's cabinet as part of the Conservative Party.

Among other distinctions, King Haakon VII named him special envoy for the coronation of George V of the United Kingdom.

[3][4] When Bratlie's Cabinet did not survive the 1913 election, Irgens accept a post as acting County Governor of Hedmark but asked to be put back into active service as a diplomat.