Lambda Sigma is an American college honor society for second-year students. Originally named the Society of Cwens,it was established at the University of Pittsburgh in 1922 as a women's honors society and became a national organization in 1925. It became the coeducational Lambda Sigma on March 6, 1975.

In the following list of Lambda Sigma and the Society of Cwens chapters, active chapters are indicated in bold and inactive chapters are in italics:

ChapterCharter date and rangeInstitutionLocationStatusAlphaUniversity of PittsburghPittsburgh, PennsylvaniaActiveBetaMiami UniversityOxford, OhioInactiveGammaUniversity of MissouriColumbia, MissouriInactiveDeltaPennsylvania State UniversityState College, PennsylvaniaInactiveEpsilonAllegheny CollegeMeadville, PennsylvaniaActiveZetaMuskingum UniversityNew Concord, OhioActiveEtaCarnegie Mellon UniversityPittsburgh, PennsylvaniaActiveThetaUniversity of KentuckyLexington, KentuckyInactiveIotaUniversity of MississippiOxford, MississippiActiveKappaSeton Hill UniversityGreensburg, PennsylvaniaInactiveLambdaUniversity of MississippiUniversity, MississippiActiveMu - 2006; March 25, 2014Eastern Kentucky UniversityRichmond, KentuckyActiveNuUniversity of LouisvilleLouisville, KentuckyInactiveXiGrove City CollegeNew Wilmington, PennsylvaniaInactiveOmicronNorthern Illinois UniversityDeKalb, IllinoisActivePiAuburn UniversityAuburn, AlabamaActiveRhoThiel CollegeGreenville, PennsylvaniaActiveSigmaAlfred UniversityAlfred, New YorkInactiveTauUniversity of KansasLawrence, KansasActiveUpsilonMorehead State UniversityMorehead, KentuckyInactivePhi ?Union CollegeBarbourville, KentuckyInactiveChiLouisiana Tech UniversityRuston, LouisianaActivePsiUniversity of Central MissouriWarrensburg, MissouriInactiveOmegaPittsburg State UniversityPittsburg, KansasActiveAlpha AlphaUniversity of Mount UnionAlliance, OhioInactiveAlpha BetaUniversity of OklahomaNorman, OklahomaInactiveAlpha GammaDuquesne UniversityPittsburgh, PennsylvaniaActiveAlpha DeltaUniversity of Southern MississippiHattiesburg, MississippiActiveAlpha EpsilonMansfield University of PennsylvaniaMansfield, PennsylvaniaActiveAlpha ZetaTexas A&M UniversityCollege Station, TexasActiveAlpha EtaPenn State Erie, The Behrend CollegeErie, PennsylvaniaActiveAlpha ThetaSlippery Rock UniversitySlippery Rock, PennsylvaniaActiveAlpha IotaMississippi State UniversityStarkville, MississippiActiveAlpha KappaGeorgia Institute of TechnologyAtlanta, GeorgiaActiveAlpha LambdaD'Youville CollegeBuffalo, New YorkActiveAlpha MuSpring 1981Berry CollegeMount Berry, GeorgiaActiveAlpha NuButler UniversityIndianapolis, IndianaInactiveAlpha XiTexas Tech UniversityLubbock, TexasInactiveAlpha OmicronPenn State BeaverCenter Township, Beaver County, PennsylvaniaInactiveAlpha PiLawrence UniversityAppleton, WisconsinActiveAlpha RhoRobert Morris UniversityMoon Township, PennsylvaniaInactiveAlpha SigmaGannon UniversityErie, PennsylvaniaActiveAlpha TauSpring 1988University of AlabamaTuscaloosa, AlabamaActiveAlpha UpsilonMount Saint Clare CollegeClinton, IowaInactiveAlpha PhiFerrum CollegeFerrum, VirginiaActiveAlpha ChiNotre Dame CollegeSouth Euclid, OhioInactiveAlpha PsiUniversity of ToledoAppleton, WisconsinActiveAlpha OmegaWestfield State UniversityWestfield, MassachusettsActiveBeta AlphaUniversity of MontevalloMontevallo, AlabamaInactiveBeta BetaMississippi University for WomenColumbus, MississippiInactiveBeta GammaUniversity of PikevillePikeville, KentuckyActiveBeta DeltaMiddle Tennessee State UniversityMurfreesboro, TennesseeActiveBeta EpsilonWashington University in St. LouisSt. Louis, MissouriActiveBeta ZetaPace University New York CityNew York City, New YorkActiveBeta EtaPace University PleasantvillePleasantville, New YorkActiveBeta ThetaUrbana UniversityUrbana, OhioInactiveBeta IotaTexas A&M University–KingsvilleKingsville, TexasInactiveBeta KappaGeorge Mason UniversityFairfax, VirginiaActiveBeta LambdaUniversity of North Carolina at PembrokePembroke, North CarolinaActiveBeta MuAlvernia UniversityReading, PennsylvaniaActiveBeta NuMinnesota State University, MankatoMankato, MinnesotaInactiveBeta XiJackson State UniversityJackson, MississippiActiveBeta OmicronUniversity of West AlabamaLivingston, AlabamaActiveBeta PiJacksonville State UniversityJacksonville, AlabamaActive

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