AOA in medical school most commonly refers to Alpha Omega Alpha, the national medical honor society. Founded in 1902, it recognizes the top students in a medical school graduating class, similar to how Phi Beta Kappa works for undergraduate students. The acronym can also stand for the American Osteopathic Association, a professional organization for osteopathic physicians, so context matters.
Alpha Omega Alpha Honor Society
Alpha Omega Alpha (AΩA) is the oldest and most widely recognized honor society in American medicine. Its founder, William W. Root, MD, established it with the motto “Be worthy to serve the suffering.” The organization’s stated mission centers on recognizing high academic achievement, honoring gifted teaching, developing leaders, supporting humanism in medicine, and promoting service.
Being elected to AOA has traditionally been one of the most prestigious distinctions a medical student can earn. It signals to residency program directors that a student performed at the top of their class, and for decades it has carried significant weight in competitive residency applications, particularly in fields like dermatology, orthopedic surgery, and plastic surgery.
How Members Are Chosen
Each medical school with an active AOA chapter can elect up to 20% of its graduating class. Selection is based on merit, though the specific criteria vary somewhat from school to school. Academic performance, including preclinical grades and clinical evaluations, plays a central role. Many chapters also consider research involvement, leadership, and community service.
Some students are elected during their third year of medical school, often called “Junior AOA.” This early induction is particularly notable because it appears on residency applications before students have even graduated. A second, larger group is typically elected during the senior year. Beyond students, schools can also elect up to 25 residents or fellows, up to 10 faculty members, and a small number of alumni each year.
Awards and Funding
AOA distributes more than $1.75 million annually in programs and awards that support medical students, residents, teachers, and community physicians. One example is its postgraduate fellowship program, which offers up to five fellowships of $6,000 each for residents and fellows pursuing research or scholarly projects. Notably, applicants for some of these awards do not need to be AOA members themselves, though any AOA members involved in the application must have active dues status.
Equity Concerns and School Departures
In recent years, AOA has faced serious criticism. Multiple studies have found racial and socioeconomic bias in the selection process, leading researchers to argue that the society contributes to structural racism in medical education. Critics have described it as an outdated institution that creates inequitable stratification among students.
At least 16 U.S. medical schools have declined to participate in AOA. The list includes some of the most competitive programs in the country: Harvard, Stanford, Yale, and UC San Francisco. UCSF specifically suspended its chapter after an internal task force concluded the selection process did not align with the school’s commitment to equity. For students at these schools, not having AOA on their application is the norm rather than a disadvantage, since residency programs are aware of which schools have active chapters.
This shift has prompted broader conversations about whether honor society membership is the best way to evaluate medical students. Some schools have replaced AOA with their own awards or recognition systems designed with more transparent, equity-focused criteria.
AOA vs. the American Osteopathic Association
The other AOA you may encounter is the American Osteopathic Association, which is something entirely different. This is the professional membership organization for osteopathic physicians (DOs) and osteopathic medical students. It represents more than 207,000 members and works to advance the practice of osteopathic medicine. While the Alpha Omega Alpha honor society exists at MD-granting (allopathic) medical schools, the American Osteopathic Association serves the DO side of the profession. If you see “AOA” in the context of someone’s medical school achievement or residency application, it almost always means the honor society. If it comes up in discussions about medical licensing, accreditation, or osteopathic practice, it likely refers to the professional association.