The University Interscholastic League (UIL) is an organization that creates rules for and administers almost all athletic, musical, and academic contests for public primary and secondary schools in the U.S. state of Texas. It is the largest organization of its type in the world.

Activities range from American football and cross-examination debate to mathematics and marching band competitions; however, the UIL does not administer Academic Decathlon competitions.

The UIL is under the governance of the Vice President for Diversity and Community Engagement at the University of Texas at Austin in Austin, Texas. Although the Texas Education Agency governs the activities of schools and school districts in Texas, the UIL does not report to TEA, but is instead a separate entity.

History The UIL was originally created by the University of Texas at Austin in 1910 as two different entities, the Debating League of Texas High Schools (to govern debating contests) and the Interscholastic Athletic Association (to govern athletic contests). The two entities merged in 1913 and adopted the UIL name.

At the time, UIL governed only white schools in Texas. From 1940 to 1970, an era of racial segregation in Texas, the Prairie View Interscholastic League (PVIL), headquartered at Prairie View A&M University, served as a separate parallel organization for African-American public high schools in Texas.

In 1965, the UIL agreed to admit PVIL member schools for competition. Black schools began UIL competitions beginning in the 1967–68 school year. After the 1969–70 school year, the UIL fully absorbed all PVIL member schools, the majority of which would later be merged with their white counterparts.

Beginning with the 2003–2004 academic year, two large all-male private schools, Dallas Jesuit and Houston Strake Jesuit, were granted UIL membership. This came after extensive court battles and negotiations from both the UIL's lawyers and the schools' joint lawyers. Previously, both schools were members of the now-defunct Texas Christian Interscholastic League (TCIL); after that league's demise and their inability to gain admittance into the Texas Association of Private and Parochial Schools (TAPPS) or Southwest Preparatory Conference (SPC), they decided to further pursue their decade-long battle of gaining membership into the UIL. They are so far the only private schools to be granted UIL membership, as the new UIL rules established after the Jesuit schools' entry prohibited those schools who were eligible for memberships in other similar associations (such as TAPPS or the SPC) to apply.

On October 10, 2010, the Third District Court of Appeals in Austin ruled that the UIL operates as a public organization and not a private organization. The ruling clarified that the UIL is legally considered a state agency and must comply with the prerequisites and duties that all other state agencies have. As a state agent, the UIL must treat individuals equally and show the purpose/need as well as a rational basis for eligibility restrictions.

The Texas Legislature rewrote titles 1 and 2 of the Texas Education Code and greatly restricted the functions to be performed by the Texas Education Agency and the UIL. The changes made Texas an equal access state. The law now requires the public schools to allow all students that reside within the school's boundary equal access to all activities. The Senate also made amendments that expressly regulate the UIL and invalidated certain UIL rules limiting student eligibility for competitions by providing that UIL rules would only apply to a student enrolled in the public school. The UIL no longer has the authority to determine the eligibility of charter/home/private school students.

All students must abide by the state No Pass No Play law. Only students that are enrolled in a public school must abide by UIL eligibility rules, even if the activity is not a UIL event.

Organization Activities for most Texas private schools are governed by separate bodies, the largest of which is TAPPS. However, private schools are allowed to join the UIL only if 1) they meet UIL's definition of a high school, 2) they are accredited by the Texas Private School Accreditation Commission, and 3) they are ineligible for membership in any league similar to UIL (such as TAPPS or the Southwest Preparatory Conference). Furthermore, private schools must compete at one classification higher than their enrollment would otherwise dictate. UIL schools are permitted to schedule contests with private schools and/or home school groups.

Charter schools must participate at no lower than the classification of the smallest high school in the district where the charter school resides; for example, a charter school within Dallas ISD must participate in at least Class AAAA, as DISD has high schools which participate at this level.

Schools are arranged by conference to ensure that schools compete on a regular basis with other schools in the geographic area of a similar size. The conferences are A (the smallest), AA, AAA, AAAA, AAAAA and AAAAAA (the largest). The corresponding alphanumeric designations (1A, 2A, 3A, 4A, 5A, and 6A) are used in everyday conversation (as well as in this article), but officially UIL only uses the alphabetic designations. The general guideline is that the UIL desires between 220 and 245 schools in Conference AAAAAA, at least 200 schools in Conferences AA, AAA, AAAA, and AAAAA with the grades 9–12 enrollment ratio for those classes no greater than 2.0 between the largest and smallest school in each class.

In addition, for football participation, a school whose enrollment is at or below 104.5 students may choose to play either six-man football (which, as of the 2014 alignment, is Conference 1A) or 11-man football (at Conference 2A). Schools with enrollments over 104.5 are only eligible for 11-man football; however, some schools organize a six-man team and play an "outlaw" schedule (i.e., the school is not eligible for the postseason). Moreover, for some events (such as team tennis, swimming, or diving), the UIL organizes all participating schools into Conference 6A and Conference 5A, with the latter encompassing all schools not meeting the Conference 6A enrollment requirements.

Within each conference, the UIL separates the schools into regions, and then further separates the regions into districts for various contests. The districts are numbered from 1 (in far west Texas) to 32 (in south Texas). There are always 32 districts in Conference 6A and Conference 5A, but the smaller conferences may have numbers skipped based on the number of schools in the conference. No more than 10 schools are permitted in a single district unless all schools and the UIL consent otherwise; the preference is for an even number of schools in each district (6, 8, 10), though in some cases travel issues may prevent such.

Previously, schools were permitted to request to be placed in a higher conference than their enrollment would otherwise dictate, usually to play at a higher level of competition. The "play up" rule was later eliminated for competition reasons, but has been retained for geographic reasons (where playing at the current level would create a travel hardship for the school), and where school districts with eight or more high schools could keep all or most of them in the same conference. However, the school must then participate at the higher conference in all UIL events in which it does participate.

Each type of contest has different regions and competitors, as there is no requirement that a school participate in all UIL events – some small rural schools do not participate in football or choose six-man over 11-man, while some magnet schools do not field athletic teams but participate in academic events only.

Unlike the college ranks or other states, the regions and districts are not permanently set, but are redrawn biennially by the UIL behind closed doors in an attempt to keep schools of similar sizes within a certain distance of their geographic area when attending competitions, and to adjust for the changing enrollments of schools (moving schools with increased attendance up in conference and those with decreased attendance down) and new schools opening. The main redrawing of regions and districts takes place on February 1 of even-numbered years (and the final allocation, especially relating to high school football, is the subject of much pre-announcement anticipation and speculation as to which schools move up or down and the final composition of the districts), but as new schools open or smaller schools close or disband programs, interim adjustments can be made.

The changing districts and regions have produced unusual results – for example, the 2008-09 Conference 5A boys' basketball championship featured champion DeSoto from Region II defeating Cedar Hill from Region I, notwithstanding that the schools were in neighboring districts.

Playoff formats Football In Conference 6A, the top four teams from each district are eligible for the playoffs. The two eligible teams with the highest student enrollment for its district are seeded in the Division I playoff bracket, and the remaining two teams (with the lower enrollment) are seeded in the Division II playoff bracket. This method is supposed to prevent matchups between large and small schools within a classification, although in practice this is not always the case – for example, in the 2006 playoffs, Southlake Carroll (the Conference 5A Division I champion; at that time 5A was the largest conference) had a lower student enrollment than Cedar Hill (the Conference 5A Division II champion).

For all other 11-man conferences and for six-man football, the UIL divides schools into separate Division I (large) and Division II (small) districts at its biennial redistricting session (in these cases, there are a maximum of 16 districts statewide, as opposed to the 32 in the larger conferences); separate playoffs are held for each division with the top four teams (top two in six-man) from each district eligible.

Other major team sports In 2A-6A volleyball, the top four teams in each district qualify for the playoffs. For 1A, the top three teams qualify for the playoffs, with the first-place team receiving a first-round bye.

In 1A-6A basketball, the top four teams in each district qualify for the playoffs.

In 4A-6A soccer, the top four teams in each district qualify for the playoffs.

In 2A-6A baseball and softball, the top four teams in each district qualify for the playoffs. In 1A baseball and softball, the top two teams qualify for the playoffs.

For baseball and softball, at all levels except the state tournament, playoff rounds are best 2-of-3 only if both coaches agree; if they do not then the coaches flip a coin to decide the format of the playoff (single game or two out of three series). At the state tournament both the semifinals and finals are single-game format.

Beginning with the 2024-2025 school year, the 6A football playoff format was implemented for 1A-6A basketball, 2A-6A volleyball, baseball and softball, and 4A-6A soccer, with the two largest schools by enrollment playing in a Division I bracket, and the two smallest schools playing in a Division II bracket.

Academics and other sports Advancement varies significantly by event. In most Academic events, the top three District medalists plus the first place District team advance to Region. Likewise, the top three Region medalists plus the first place Region team advance to State competition. Furthermore, the highest-scoring second place team in each Region at District competition advances to Region as a Wild Card, and the highest scoring second place Region team advances to State as a Wild Card. In Computer Applications, all Journalism events, all Speech & Debate events, and Ready Writing, no team component, and therefore no wild cards, exist. Exceptions include the following: