Ágúst Sigurður Björgvinsson (born 16 January 1979) is an Icelandic professional basketball coach who last coached Úrvalsdeild karla club Valur. He was the head coach of the Icelandic women's national basketball team from 2007 to 2009 and won back-to-back national championships with Haukar women's team in 2006 and 2007.