Thorvald Steen (born 9 January 1954) is a Norwegian writer and government scholar.

His Norwegian breakthrough came in 1992 with a cycle of poems, Ilden (The Fire) and shortly afterward he achieved international recognition with his creative historical novels Don Carlos (1993), Giovanni (1995), Constantinople (1999), The Little Horse (2002), Camel Clouds (2004) and Lionheart (2010).

In 2006 Steen wrote the coming-of-age novel The Weight of Snow Crystals, which was followed in 2008 with the freestanding sequel The Longest Leap.

The Belgian newspaper Le Soir declared Don Carlos one of the five best novels translated into French in 1996.

The newspaper Clarin in Argentina chose Steen as “Best new writer” for Don Carlos the same year.