Bjarni Vigfússon Thorarensen (December 30, 1786 – August 24, 1841) was an Icelandic poet and official.
He was deputy governor of northern and eastern Iceland.
As a poet he was influenced by classicism and romanticism.
Politically he was aligned with the Fjölnismenn and favored the reestablishment of the Althing at Þingvellir.
He was a friend of Jónas Hallgrímsson whose own poetry was influenced by Bjarni's work.
Bjarni's best known work is Íslands minni, also known as Eldgamla Ísafold.