Bergþóra Árnadóttir (15 February 1948 – 8 March 2007) was an Icelandic folk song composer and singer. Many of her songs were built around the lyrics of Icelandic poets. In the mid 1970s, she hosted and performed in one of Icelandic TVs first music shows, Kvartett Guðmundar Steingríms.
She was the mother of Pirate Party's leader Birgitta Jónsdóttir.