The Monsignor Martin High School Athletic Association is an athletic league founded in 1948. It is comprised of Catholic high schools and private secular high schools in Western New York. Member schools compete for the Supremacy Cup, which is awarded to the school in each division that wins the most championships during a school year.

Member schools include
 
Boys:

Bishop Timon-St. Jude High School
Canisius High School
Saint Francis High School
St. Joseph’s Collegiate Institute

Girls:

Buffalo Academy of the Sacred Heart
Buffalo Seminary
Mount Mercy Academy
Mount Saint Mary Academy
Nardin Academy

Co-Educational:

Archbishop Walsh High School
Cardinal O’Hara High School
Christian Central Academy
Gow School
Nichols School
St. Mary’s High School
Park School of Buffalo