The Maryland Interscholastic Athletic Association (or MIAA) is a boys' sports conference for private high schools generally located in the Baltimore metropolitan area but extending to various other regions, including the state's mostly rural Eastern Shore. The MIAA has 27 member schools and offers competition in 17 sports. In most sports, it offers multiple levels of competition, including Varsity, Junior Varsity, and Freshmen-Sophomore teams, and the conference is broken down by separate leagues in each. In addition, members are sorted in accordance to continual performance; categories include A, B, or C conference. Teams of the league may move up or down according to their performance spanning over the course of a year or so to maintain the competition at appropriate levels. Such levels vary for each sport; a school with a "B-conference" lacrosse team can have an "A-Conference" soccer team: it all depends on the athletic performance of that particular sport.

The MIAA is notable for its lacrosse, in which the "A" Conference is considered one of the best, if not the best, high school leagues in the United States. Additionally, the MIAA "A" soccer conference is widely considered the best high school conference in Maryland, with teams such as Calvert Hall

Calvert Hall College High School

Calvert Hall College High School is a Catholic college preparatory high school for boys located in Towson, Maryland, United States...

, Archbishop Curley

Archbishop Curley High School

Archbishop Curley High School, is a Roman Catholic men's high school located in the Roman Catholic Archdiocese of Baltimore in the USA. It is affiliated with the Franciscan religious order and is named in honor of Archbishop Michael J. Curley , who served as the tenth Archbishop of Baltimore from...

, Mount Saint Joseph

Mount Saint Joseph College

Mount Saint Joseph High School, is a private, Catholic high school located in Baltimore, Maryland in the community of Irvington. The campus consists of four academic buildings, an athletic field house, and housing for the school's chaplains. It was founded by the Xaverian Brothers in November 1876...

, Boys' Latin

Boys' Latin School of Maryland

Boys' Latin School of Maryland is an all-boys, college-preparatory school located in Baltimore, Maryland. Founded in 1844, it is the oldest independent, non-sectarian secondary school in the state of Maryland. The school is divided into Lower, Middle and Upper Schools...

, St. Paul's and McDonogh

McDonogh School

McDonogh School is a private, coeducational, K-12, college-preparatory school founded in Owings Mills, Maryland, USA in 1873.- History :The school was established near Baltimore, Maryland in 1873 and funded by the estate of John McDonogh, a former Baltimore resident, who died in 1850...

 that have all been nationally ranked. Cross-Country has also produced several fine athletes, often receiving scholarships from NCAA Division I colleges and universities.

Seven members of the MIAA (along with non-MIAA member St. Maria Goretti) also form the Baltimore Catholic League

Baltimore Catholic League

The Baltimore Catholic League , locally known as the Catholic League is a competitive basketball association composed of private Catholic high schools in the Baltimore, Maryland geographic area.- History :...

 in basketball. In addition, many of the same schools compete in the Interscholastic Athletic Association of Maryland in girls' sports, together with the all-female schools of the same region.

Member schools

• Annapolis Area Christian School
  Annapolis Area Christian School
  Annapolis Area Christian School is a private, non-denominational Christian school located in Annapolis and Severn, Maryland. It serves grades pre-K through 12 and currently enrolls about 1000 students.It was founded in the Reformed tradition in 1971...
  
  
• Archbishop Curley High School
  Archbishop Curley High School
  Archbishop Curley High School, is a Roman Catholic men's high school located in the Roman Catholic Archdiocese of Baltimore in the USA. It is affiliated with the Franciscan religious order and is named in honor of Archbishop Michael J. Curley , who served as the tenth Archbishop of Baltimore from...
  
  
• Archbishop Spalding High School
  Archbishop Spalding High School
  Archbishop Spalding High School is a private, Catholic co-educational high school located in Severn, Maryland. It is located in the Roman Catholic Archdiocese of Baltimore. Most of its students live in Annapolis, Crownsville, Arnold, Pasadena, Severna Park, Crofton, Millersville, Glen Burnie, or...
  
  
• Baltimore Lutheran School
  Baltimore Lutheran School
  Baltimore Lutheran School is a co-educational parochial secondary school serving grades 6-12. Baltimore Lutheran School is located in Towson, Maryland, United States. BLS is operated by the Baltimore Lutheran High School Association, Inc., an association of Lutheran churches in the Baltimore...
  
  
• Beth Tfiloh Dahan Community School
  Beth Tfiloh Dahan Community School
  Beth Tfiloh Dahan Community School is a community Jewish day school in Baltimore County, Maryland. It encompasses preschool through twelfth grade. The school has one campus in Pikesville The campus includes the PreSchool, Lower School , Middle School , and the High School...
  
  
• Boys' Latin School of Maryland
  Boys' Latin School of Maryland
  Boys' Latin School of Maryland is an all-boys, college-preparatory school located in Baltimore, Maryland. Founded in 1844, it is the oldest independent, non-sectarian secondary school in the state of Maryland. The school is divided into Lower, Middle and Upper Schools...
  
  
• Calvert Hall College High School
  Calvert Hall College High School
  Calvert Hall College High School is a Catholic college preparatory high school for boys located in Towson, Maryland, United States...
  
  
• Chapelgate Christian Academy
  Chapelgate Christian Academy
  Chapelgate Christian Academy is a secondary school located in Marriottsville, Howard County, Maryland. It is part of the Howard and Carroll County Public School System.-External links:*...
  
  
• Friends School of Baltimore
  Friends School of Baltimore
  Friends School of Baltimore is a private Quaker school in Baltimore, serving students in pre-kindergarten through 12th grade.-History:It is the oldest private school in Baltimore, founded in 1784 by members of the Religious Society of Friends . Classes were first held in the Aisquith Street...
  
  
• Georgetown Preparatory School
  Georgetown Preparatory School
  Georgetown Preparatory School is an American Jesuit college preparatory school for grades 9 through 12. It is the oldest all boys school in the United States, and the only Jesuit boarding school in the country...
  
   (Football Only)
• Gilman School
  Gilman School
  Gilman School is a private preparatory school for boys located in the Roland Park neighborhood of Baltimore, Maryland. Founded in 1897 as the Country School for Boys, it was the first country day school in the United States. Gilman enrolls approximately 978 students, ranging from kindergarten to...
  
  
• Glenelg Country School
  Glenelg Country School
  Glenelg Country School is a nonsectarian, co-educational independent day school in Howard County, Maryland, adjacent to Columbia, Maryland and between Baltimore and Washington, D.C...
  
  
• The John Carroll School
  The John Carroll School
  The John Carroll School, established in 1964, is a private, independent, college-preparatory, co-educational Catholic school for grades 9–12, located on in Bel Air, Maryland...
  
  
• The Key School
  The Key School
  The Key School is an independent coeducational school, located in the neighborhood of Hillsmere Shores in Annapolis, Maryland. Known simply as "Key" by members of the community, it is one of several independent private schools in the Annapolis area. The school is attended by all age groups, with...
  
  
• Loyola Blakefield
  Loyola Blakefield
  Loyola Blakefield is a Catholic, college preparatory school established by the Society of Jesus, to educate men for others. The ideal Loyola graduate is a man of integrity who, because he strives "to find God in all things," is open to growth, dedicated to academic excellence, religious, committed...
  
  
• McDonogh School
  McDonogh School
  McDonogh School is a private, coeducational, K-12, college-preparatory school founded in Owings Mills, Maryland, USA in 1873.- History :The school was established near Baltimore, Maryland in 1873 and funded by the estate of John McDonogh, a former Baltimore resident, who died in 1850...
  
  
• Mount Saint Joseph College
  Mount Saint Joseph College
  Mount Saint Joseph High School, is a private, Catholic high school located in Baltimore, Maryland in the community of Irvington. The campus consists of four academic buildings, an athletic field house, and housing for the school's chaplains. It was founded by the Xaverian Brothers in November 1876...
  
  
• Our Lady of Mount Carmel High School
• Park School of Baltimore
  Park School of Baltimore
  The Park School of Baltimore is a private, co-educational K-12 school located in Brooklandville, Maryland, USA, just north of the city of Baltimore. The campus lies to the south of Old Court Road in Baltimore County...
  
  
• Severn School
  Severn School
  Severn School was founded in 1914 by Rolland M. Teel in Severna Park, Maryland, as a preparatory school for the United States Naval Academy. Today, Severn is a day school enrolling boys and girls in grades 6 through 12...
  
  
• St. Frances Academy
  St. Frances Academy (Baltimore, Maryland)
  St. Frances Academy is a private, Roman Catholic high school in Baltimore, Maryland. It is located in the Roman Catholic Archdiocese of Baltimore.-Background:...
  
  
• St. John's Catholic Prep
  Saint John's Catholic Prep (Maryland)
  Saint John's Catholic Prep is a private, Roman Catholic high school in Frederick, Maryland. It was scheduled to move to Buckeystown, Maryland in 2010; however, ground has not yet been broken at their new location and it will most likely be some time before the move takes place...
  
  
• St. Mary's High School
• St. Paul's School
• St. Vincent Pallotti High School
  St. Vincent Pallotti High School
  St. Vincent Pallotti Preparatory High School, usually called Pallotti, is a private school located in eastern Laurel, Maryland. It was founded by the Pallottines in 1921 and is within in the Roman Catholic Archdiocese of Washington....
  
  
• Saints Peter & Paul High School
• Indian Creek School
  Indian Creek School
  Indian Creek School is a coeducational, private day school located in Crownsville, Maryland, USA near Annapolis, Maryland. The school was founded in September 1973. The original 17-acre campus houses classes for grades pre-kindergarten through eighth. In September 2004 Indian Creek began an upper...