Sigfús Eymundsson (1837–1911) was an Icelandic photographer and bookseller.
He practiced bookbinding from a young age and in 1857 he went to Copenhagen to study the profession.
He then operated a studio in Copenhagen for a year and a half before moving back to Iceland in 1866.
In 1867 he opened the first commercial studio in Reykjavík.
He also founded the Eymundsson bookstore and published a number of books.