Lagertha Munthe (1888 – 1984) was a Norwegian painter.
She was born in Kristiania[1] as a daughter of Olaf Andreas Jens Wilhelm Munthe (1851–1914). She was a grandniece of historian and cartographer Gerhard Munthe, a niece of historian Hartvig Andreas Munthe, painter Gerhard Munthe, writer Margrethe Munthe and Major General Carl Oscar Munthe, and a first cousin of librarian Wilhelm Munthe and genealogist Christopher Morgenstierne Munthe.[2]
She studied at the Norwegian National Academy of Fine Arts from 1909 to 1911, under notable painters such as Christian Krohg, Halfdan Strøm, Oluf Wold-Torne and Henrik Sørensen. Several of her landscape paintings are owned by the National Gallery of Norway.[1]