The Alpha Omega Alpha Honorary Medical Fraternity was organized at the College of Medicine, University of Illinois, in 1902. In 1934 its name was changed to Alpha Omega Alpha Honorary Medical Society. The McGill Chapter (Alpha of Québec) was established in 1911. The Society is formed of undergraduate medical students of high scholastic achievement, alumni and faculty members, and honorary members, and its major activity on the local chapter level is attending lecture-discussions on topics of medical interest.

In 1889, the first eight women to earn degrees at McGill formed the Mu Teta Society, and in 1890, the name was changed to the Alumnae Society of McGill University. The society's original intention was to maintain close contact with former classmates and to provide assistance to McGill women students. Its objectives later expanded to include educational and social service activities for the Montreal community. The Alumnae Society accomplished these objectives through the work of its various committees, which have given support to special projects at times, such as the University Settlement, the Montreal Children's Library and the St. Anne's Military Hospital Library. The society has had a close connection to Royal Victoria College and is affiliated with the Canadian Federation of University Women and the local Montreal Council of Women. In the 1980s, the Alumnae Society represented the largest branch and club of the Graduates' Society (incorporated in 1880).

The American Academy of Arts and Sciences (AAA&S) is one of the oldest honorary societies and independent research centers in the United States. It was founded on May 4, 1780, during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and other founding fathers of the United States. Its headquarters are in Cambridge, Massachusetts. The first class of new members, chosen by the Academy in 1781, included Benjamin Franklin, George Washington, and several international honorary members. The initial volume of Academy Memoirs appeared in 1785, and the Proceedings followed in 1846. In the 1950s, the Academy launched its quarterly journal Daedalus, reflecting its commitment to a broader intellectual and socially oriented program and published by the MIT Press on behalf of the Academy. Membership in the academy is achieved through a thorough petition, review, and election process. The Academy also conducts multidisciplinary public policy research. It has over 5,700 active members.

The American Association of Medical Social Workers was formed in the words of its Constitution, "to serve as an organ of intercommunication among hospital social workers, to maintain and improve standards of social work in medical or psychiatric institutions and to stimulate its intensive and extensive development." The Eastern Canada Division was created in 1920, and comprised individuals and institutions in Québec, Ontario and the Maritimes. Meetings were open to all social workers, and in the Montréal branch, to social work students at McGill. Most of the membership was English-speaking and worked in hospitals or social agencies.

American Automobile Association (AAA) is a federation of motor clubs throughout North America. AAA is a privately held not-for-profit national member association and service organization with over 60 million members in the United States and Canada. It provides services to its members, including roadside assistance and others. Its national headquarters are in Heathrow, Florida.

It was founded on March 4, 1902, in Chicago, Illinois, in response to a lack of roads and highways suitable for automobiles. The first AAA road maps were published in 1905, and in 1917, it began printing hotel guides. The AAA began its School Safety Patrol Program in 1920, the first of the association's driver safety programs that provided local schools with materials, including badges and ID cards, to train and organize students into a patrol force. The AAA Foundation for Traffic Safety, which conducts studies on motorist safety, was established as a separate entity in 1947. In the 1960s, AAA helped draft the National Traffic and Motor Vehicle Safety Act of 1966, setting safety standards for automobiles, tires, and equipment. AAA also helped draft the Highway Safety Act, specifying standards for motor vehicle inspection and registration, motorcycle safety, driver education, driver licensing, traffic courts, highway design, construction, maintenance, and traffic control devices. During the Jim Crow era, AAA actively discriminated against African Americans, who could not join the association. Alternatives to AAA guides, such as The Negro Motorist Green Book, were written.

The American College of Mechano-Therapy operated in Chicago, IL, between roughly 1905 and 1920. It was founded by William Charles Schulze, an 1897 graduate of Rush Medical College and practicing MD licensed in Illinois, Minnesota, and Wisconsin. Schulze was born in Germany in 1870. Schulze incorporated the American College of Mechano-Therapy in 1907 and served as its president. Purporting to be the “largest eclectic school of drugless healing in the world,” the College offered a training course via correspondence. Though heavily criticized by the medical establishment, mechanical methods of healing nonetheless were increasingly popular in North America in the early part of the 20th century.