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.
Frank Jæger lader i sin sene prosa, blandt andet Danskere (1966), Døden i Skoven (1970) og Provinser (1972) en mørkere skepsis over for livet vinde frem. Her handler det ikke mindst om kunstnerens isolation og krise — fortvivlelsen, selvbedraget — skildret med så stor styrke, at selvopgøret dog rummer en kunstnerisk selvbekræftelse.