Lambda Sigma (ΛΣ) is an American college honor society for second-year students. Originally named the Society of Cwens, the society was established at the University of Pittsburgh in Fall 1922 as a women's honors society, and became a national organization with the 1925 foundation of chapters at Miami University and the University of Missouri. The society is "dedicated to the purpose of fostering leadership, scholarship, fellowship, and the spirit of service among college students, and to promoting the interests of the college or university in every possible way".