Frank Jæger (19 June 1926 - 4 July 1977) was a Danish writer most known for his poetry and radio plays. He received the Grand Prize of the Danish Academy in 1969. He also edited two volumes of Heretica magazine with Tage Skou-Hansen.
Jæger was born in the Frederiksberg district of Copenhagen on 19 June 1926. He graduated from Schneekloth's School in 1945 and from the Royal School of Library Science in 1950 but could by then already make a living from his writings.