Phi Sigma Pi is a proud member of the following organizations:

Association of Fraternity Advisors – The AFA, founded in 1976, has provided individuals concerned with the fraternity/sorority movement an avenue for professional growth and development. The Association of Fraternity Advisors exists to support the professional development of our members, foster partnerships across higher education, and offer innovative resources and services to persons involved in the advisement of fraternities and sororities. AFA enhances members' ability to create fraternity and sorority experiences that positively affect students, host institutions, and communities. Our vision for the future is a unified fraternal movement and an increased recognition of the value of the fraternity and sorority experience.

Collegiate Fraternity Editors Association – The College Fraternity Editors Association is composed of fraternities and sororities committed to communicating the highest ideals of the fraternity system and its achievements. Some of its key objectives include: to promote the fraternity system and its values, standards and achievements and the ideas and constructive contributions of its members; to strive to encourage new levels of accomplishment, both individual and group, as a result of reporting and editing the accomplishments of our fraternities; and to provide clear and in-depth information to our members and readers about developments in, of and by the organizations we represent, and to afford the members a timely vehicle for the expression of their comments and attitudes devoted to the betterment of the organization and its ideals and goals.

The Lancaster Chamber of Commerce & Industry – The Not-For-Profit Program is designed to build relationships and promote networking inside and out of the nonprofit circle within Lancaster County. It provides opportunities to share ideas, challenges, successes and solutions with other Not-For-Profits.

National Association of Student Personnel Administration – NASPA serves its members through a wide range of services, including outstanding quarterly publications such as the NASPA Journal and Leadership Exchange, a management magazine, a variety of professional development opportunities for student affairs individuals at all levels within the profession, and a comprehensive, content-rich website that is the most widely accessed website in the student affairs association community.

Professional Fraternity Association – The PFA was formed in 1978. It resulted from the merger of the Professional Interfraternity Conference, for men's groups, and the Professional Panhellenic Association, for women's groups. The merger of the two original groups resulted from the passage of Title IX by the U.S. Congress in the early 1970s -- effectively ending gender distinctions for most fraternal groups with professional affiliations. To be eligible for membership, a fraternity must be national or international in character and shall charter its institutional chapters only at appropriately accredited colleges, universities, or professional schools. The fraternity shall be identified by, or related to a field of study or common interest. Member fraternities may also initiate members of other fraternities.