Brynild Anundsen (December 29, 1844 – March 25, 1913) was a Norwegian-American newspaper editor and publisher. He was the founder of Decorah Posten, a Norwegian language newspaper.
Brynild Anundsen was born in Skien in Telemark county, Norway. He was the son of Anund Brynildsen Brækkejord (1817–1903) and Maren Amundsdatter Berberg (1812–1883). Anundsen immigrated to the United States during 1864 settling first into La Crosse, Wisconsin. He subsequently served as a private in the Union Army during the American Civil War between 1864 and 1865.
Anundsen, who had learned the printer's trade in Norway, worked for the Norwegian language newspapers Emigranten in Madison, Wisconsin, and Fædrelandet og emigranten of La Crosse, Wisconsin. In 1867 he moved to Decorah, Iowa, where he established Ved Arnen, a Norwegian language literary magazine in 1866. In 1868 he took over the printing of the journal, Kirkelig Maanedstidende for the Norwegian Synod, an arrangement which continued until 1877. He started the newspaper Fra Fjærnt og Nær in 1869.
On September 18, 1874, Anundsen started Decorah Posten. It was a well-edited newspaper, its size and familiar format developed gradually. The publisher avoided areas of political and religious controversy, which had destroyed so many earlier papers. Anundsen made a success of the Decorah Posten and went on to establish the Anundsen Publishing Company. Anundsen was a founder of the Norwegian Society in America (Norwegian: Det Norske Selskab i Amerika). In 1878 he participated in the founding of the Norwegian Society in Decorah and 1903 The Norwegian Society of America. In 1895, he was co-founder and first president of the Norwegian-Danish Press Association of the United States.
In 1865, Anundsen was married in La Crosse, Wisconsin, to Esther Mathilde Charlotte Hofstrom (1838–1889), a native of Sweden. Following the death of his first wife, he married Helma Beatha Hegg (1872–1951) in 1901. He was the father of Fred Anundsen (1872–1931) and Brynjolf Anundsen (1902–1984).