Peter B. Olsen (April 11, 1848 – July 3, 1926) was an American newspaper editor and politician.
Olsen was born in Christiana, Norway on April 11, 1848. He emigrated to the United States in 1872.
He was a printer by trade and became the literary editor for the Skandinaven in Chicago, Illinois.
From 1899 to 1903, he served as a Republican representative in the Illinois House of Representatives. From 1900 to 1906, he served as the Clerk of Cook County, Illinois.
Olsen was a close associate of fellow Chicago politician Henry L. Hertz.
Olsen died at a hospital in Chicago, Illinois on July 3, 1926.