Yrsa Sigurðardóttir is an Icelandic writer, of both crime-novels and children's fiction. She has been writing since 1998.
Her début crime-novel "Last Rituals" published in the US in 2007, and the UK in January 2008 was translated into English by Bernard Scudder, and is book 1 of the Thóra Gudmundsdóttir series.

Yrsa Sigurðardóttir graduated from high-school in 1983, finished a B.Sc. in civil engineering from the University of Iceland in 1988 and M.Sc in the same field from Concordia University in Montreal in 1997.

Yrsa now works as a civil engineer for the company Fjarhitun, as well as being a writer.

In 2000 the Icelandic department of IBBY (International Board on Books for Young People) awarded Yrsa for her book Við viljum jólin í júlí (We Want Christmas in July).

Yrsa lives in the Reykjavík suburb of Seltjarnarnes. She is married with two children.