Sigfús is a masculine given name. Notable people with the name include:
Sigfús Blöndal (1874–1950), Icelandic linguist and librarian Sigfús Daðason, Icelandic poet Sigfús Einarsson, Icelandic composer Sigfús Eymundsson, Icelandic photographer and bookseller Sigfús Sigurðsson (athlete) (1922–1999), Icelandic Olympic athlete Sigfús Sigurðsson (handballer) (born 1975), Icelandic handball player, grandson of the above