Baldur Ragnarsson (25 August 1930 – 25 December 2018) was an Icelandic poet and author of Esperanto works. He was a teacher and a superintendent of schools in Iceland. His best known work was La lingvo serena. He was in charge of the World Esperanto Association's literary contest from 1975 to 1985. He was president of the organizing committee for the 1977 World Esperanto Congress at Reykjavík and vice-president of the World Esperanto Association.
Ragnarsson died on 25 December 2018 in Reykjavík at the age of 88.