Lambda Omega (ΛΩ) was a national collegiate sorority operating in the United States from October 31, 1915 until 1933.

The Norroena Club was founded in 1915 on the campus of University of California, Berkeley.

The motif emphasized the hardihood, hospitality, economy, and friendship of the Norse (Miner, p. 180).

notes that Lambda Omega's founding date was May 5, 1923 to coincide with this name change, and marked the decision to expand nationally.

The sorority was granted associate membership in the National Panhellenic Conference (Martin, p. 70.