Lambda Theta Alpha

Lambda Theta Alpha Latin Sorority, Inc. (ΛΘΑ) is the first and largest intercollegiate Latina-based sorority. It was established in 1975 at Kean University. It has expanded to 150 undergraduate chapters and 30 alumnae chapters. The sorority was a member of the National Association of Latino Fraternal Organizations.

Lambda Theta Alpha Latin Sorority, Inc. was founded on December 1, 1975, at Kean College in Union Township, New Jersey, by seventeen women who sought to create a sisterhood that would provide support for Latina students in higher education. Keen College introduced bilingual studies, as well as a Latino and Caribbean Studies Department in 1975, allowing women of Latin descent whose first language was not English to attended the college. Recognizing the need for an organization that represented their cultural background and addressed the specific challenges faced by Latina students, the founders established the sorority that was "committed to empowering women, fostering leadership, and advocating for cultural awareness and social justice". It also emphasized keeping its members in college.

Lambda Theta Alpha was the first Latina-based sorority in the United States. It was established by seventeen women who are recognized as the Founding Mothers of the organization, including Ileana Almaguer, Cecilia Alvarez, Carmen Baez, Karen Capra, Doris Cruz, Arlene Fernandez, Eneida Figueroa, Maria Gautier, Teresa Gonzalez, Dra. Thomasa Gonzalez, Diana Ibarria, Lillian Marrero, Ofelia Oviedo, Linda Perez, Aurora "Dory" Rodriguez, Maria del Carmen Vega, and Marilyn Wyatt.

Kean College recognized the sorority in 1975. The sorority initiated its first line on December 17, 1979. Over time, Lambda Theta Alpha expanded beyond Kean College, forming chapters across New Jersey.

Lambda Theta Alpha established a board of directors in 1987. It held its first national convention in 1991. In 1992, the sorority established its first chapter outside of New Jersey, becoming a national organization. It established its Alumni Association on November 18, 1995. By 2000, the sorority had expanded to fifty collegiate chapters.

The sorority joined the National Association of Latino Fraternal Organizations in January 2001, although it rescinded its membership in 2014. The National Association of Latino Fraternal Organizations recognized Lambda Theta Alpha as its Sorority of the Year for 2013–2014.

In August 2017, members of the Gamma Alpha chapter of Lambda Theta Alpha at the University of Virginia participated in counter-protest efforts during the Unite the Right rally in Charlottesville, Virginia. In response to the events that took place, the sorority issued a statement supporting racial justice and condemning racism, hate, and intolerance.

As of 2025, Lambda Theta Alpha has 539 active undergraduate members and 1,609 alumnae members, or 2,148 total initiates. Its national headquarters is in Ithaca, New York.