Acacia Fraternity, Inc. is a social fraternity founded in 1904 at the University of Michigan in Ann Arbor, Michigan. The fraternity has 27 active chapters and 3 associate chapters throughout Canada and the United States. The fraternity was founded by undergraduate Freemasons and was originally open only to men who had taken the Masonic obligations, but in 1933 the International Conclave elected to dispense with the Masonic prerequisite. In 1988, at the 45th Conclave, the fraternity elected to use "International" rather than "National" when referring to the fraternity.

In North America, fraternities and sororities are social organizations at colleges and universities. They are sometimes collectively referred to as Greek life. Generally, membership in a fraternity or sorority is obtained as an undergraduate student but continues thereafter for life. Some accept graduate students as well. Individual fraternities and sororities vary in organization and purpose, but most share five common elements:Secrecy Single-sex membership Selection of new members based on a two-part vetting and probationary process known as rushing and pledging Ownership and occupancy of a residential property where undergraduate members live A set of complex identification symbols that may include Greek letters, armorial achievements, ciphers, badges, grips, hand signs, passwords, flowers, and colors