Alette Marie Engelhart, née Nicolaysen (7 May 1896 – 13 August 1984) was a Norwegian housewives' leader.
Alette was born in Kristiania as a daughter of captain and engineer Anton Martin Schweigaard Nicolaysen (1870–1907) and Dorothea Jeanette Horn (1870–1943).
She was a niece of Hassa Horn[1] and a grandniece of Hassa Horn, Sr. She finished her secondary education at Frogner School in 1915, and graduated as a teacher from Nissen School in 1916.
The family moved around in Norway a lot, among others to Harstad and Eidsvoll.
She chaired the United Nations Association of Norway from 1948 to 1952, and was active in Foreningen Norden and Landsforeningen Norsk Arbeide.