Waldemar Sefland Dahl (06 Apr 1900 – 20 Jun 1984) was a Norwegian painter and sculptor.
He was born in Fredrikstad to parents Mons Carolus Dahl and Julie Frasiska Holm, and took his education at the Norwegian National Academy of Fine Arts. He made his mark in Fredrikstad, with decorations at the City Hall and Vestre Fredrikstad Church,[1] as well as twelve busts spread across the city.[2] His portrait of Jakob Sande is owned by the National Gallery of Norway.[1]