Michigan High School Athletic Association
The Michigan High School Athletic Association (MHSAA) is a service organization for high school sports in Michigan and is headquartered in East Lansing. It is a member of the National Federation of State High School Associations (NFHS).

Unlike many other NFHS member organizations, 
*The MHSAA does not charge membership fees for schools; it derives its income from ticket sales at tournament level games and a handful of corporate sponsorships.
*It is independent of and not officially recognized by any governmental body, local or statewide.
*Membership is voluntary; no Michigan high school is compelled by law to be an MHSAA member.

As of August 13, 2019, the MHSAA has 749 member high schools, comprising virtually all high school athletics in Michigan, public and private. Only a small number of private schools and a few nontraditional public schools in Michigan forgo MHSAA membership. MHSAA member schools may compete against non-member school in interscholastic athletic competition.

The MHSAA supports 28 sports.

Boys: Baseball, Basketball, Bowling, Cross Country, Football, Golf, Ice Hockey, Lacrosse, Alpine Skiing, Soccer, Swimming & Diving, Tennis, Track & Field, Wrestling

Girls: Basketball, Bowling, Competitive Cheer, Cross Country, Golf, Gymnastics, Lacrosse, Alpine Skiing, Soccer, Softball, Swimming & Diving, Tennis, Track & Field, Volleyball

Technically, all "boys" teams are officially "boys & girls" teams, while "girls" teams are "girls only," although having girls actually play on "boys & girls" teams is approximately as uncommon as in the many other states using a similar arrangement. (An example is Norway, Michigan's tennis team).

Traditional classifications used are labeled A, B, C and D from largest to smallest. Each grouping consists of 25% (or as close as is mathematically practicable) of all member schools sorted by student population, including a variety of correction factors. Total 4-year coed enrollment cutoffs for the 2019–20 school year are as follows:
* Class A: 863 and above
* Class B: 395-862
* Class C: 189-394
* Class D: 188 and below

The traditional classifications have the same number of "schools" (or as close as mathematically possible) in each of them, but not necessarily the same number of "teams" in a given sport's tournament; smaller schools are unable to support as many sport teams, although they may form cooperative programs classified by the combined enrollments of the schools involved. In order to prevent distorted tournament structures, for all sports the MHSAA uses "nearly equal divisions," where only those schools sponsoring a team in the given sport are broken into as many equally sized groupings (or as close to equal as is mathematically possible) as the Association feels is appropriate given the number of schools sponsoring the sport. The MHSAA's tournament structures are similar to those used in many other States; schools are assigned to Regions and, in those sports where it is appropriate, Districts. Assignments are made on a sport-to-sport and year-to-year basis, meaning that as no two sports have identical classification methods and sponsorship levels, a given school will usually have at least minor variations in its overall tournament path from sport to sport.

Unlike in some states, regional and district placement has no bearing on regular season scheduling; schools form conferences on their own or compete as independents, although conferences generally consist of similarly sized schools which are geographically proximate to each other. Except in football, all schools in good standing fielding teams in a particular sport are allowed to enter that sport's postseason tournament which crowns a champion. Some sport championship tournaments are divided into separate Upper Peninsula and Lower Peninsula tournaments; an example of this is tennis. Schools pay no entry fees to participate in MHSAA tournaments, which are paid for out of ticket sales, sponsorships and broadcast rights fees.

For football, postseason inclusion was, through 2019, determined by wins and a computer point value, calculated for each team based upon its record and strength of schedule, with the top 256 teams (including all teams with six victories if playing a nine-game schedule) qualifying. These 256 teams were then ordered by enrollment and divided into 8 divisions of 32 teams each. This was nearly unique amongst high school football competition in the U.S. in that many teams do not know which classification they will compete for a state title in until after the regular season has ended; the Illinois High School Association, North Carolina High School Athletic Association, and Wisconsin Interscholastic Athletic Association also have a similar format. The MHSAA announced in 2019 that, beginning with the 2020 season, its football playoff system would change: The aforementioned computer point value (derived from a combination of a team's own record, its opponents' record and its opponents' opponents' record, with points awarded based on which of the four classes each opponent is in) will be the sole method to select playoff teams, and the eight divisions will be set in advance of the season.

Participation in Michigan is generally limited to eligible 9th through 12th graders; students are given eight consecutive semesters of eligibility beginning with the 9th grade. Schools with a four-year high school enrollment of 99 or less may draw upon the 8th grade for varsity competition in all sports except football, ice hockey and wrestling, while schools with a four-year high school enrollment of 49 or less may also draw upon the 7th grade.

The MHSAA is considered a leader among state high school offices and is known for pro-actively implementing solutions to problems faced by all state offices and for committing substantial resources to technological improvements.
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National Federation of State High School Associations
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Illinois High School Association
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Michigan High School Athletic Association
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