Heiða Rún Sigurðardóttir (born 22 May 1988), known under her stage nameHeida Reed, is an Icelandic actress and model. She is known for playing parts in One Day, Jo (2013), Silent Witness (2014) and the BBC drama Poldark.
Reed left Iceland when she was 18. When she was 20, she settled in London, where she studied drama at Drama Centre London, graduating in 2010.
In April 2015, Reed co-starred in the world premiere of a new play, Scarlet, by Sam H Freeman at Southwark Playhouse exploring slut-shaming and cyberbullying and their emotional repercussions. The producers, Theatre Renegade, worked with The White Ribbon Campaign to support the production's cast and creatives whilst working on the production as well as running informative talks and Q&As dealing with some of the issues addressed in the play. The production was nominated for two Off West End Theatre Awards: Best Production and Best Ensemble.