Hera Björk Þórhallsdóttir is an Icelandic singer. She is known for representing Iceland in the Eurovision Song Contest 2010 with the song "Je ne sais quoi", where she finished 19th, and at the Viña del Mar International Song Festival 2013 with the song "Because You Can", where she won in the Best Song category.

Iceland participated in the Eurovision Song Contest 2010 with the song "Je ne sais quoi", written by Örlygur Smári and Hera Björk and performed by Björk. The Icelandic entry for the 2010 contest in Oslo, Norway was selected through the national final Söngvakeppni Sjónvarpsins 2010, organised by the Icelandic broadcaster Ríkisútvarpið (RÚV). The selection process consisted of three semi-finals and a final, held on 9 January, 16 January, 23 January and 6 February 2010, respectively. Five songs competed in each semi-final with the top two as selected by a public televote advancing to the final. In the final, "Je ne sais quoi" performed by Björk emerged as the winner exclusively through public televoting. Promotional activities for the entry included the release of a music video and album and performances of the song in Norway and at the UKeurovision Preview Party in London.