Independent School League

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The Independent School League or ISL is a group of seventeen United States, (Washington, D.C.-area), preparatory schools that compete with each other athletically. Schools are noted for their academic rigor and traditional rivalries. All competitors in the ISL are girls, but not all schools are "all-girls" schools.

Independent School League schools include:

• The Bullis School
• Connelly School of the Holy Child
• Episcopal High School
• Flint Hill School
• Foxcroft School
• Georgetown Day School
• Georgetown Visitation Preparatory School
• Holton-Arms School
• The Madeira School
• Maret School
• The Model Secondary School
• National Cathedral School
• The Potomac School
• Sidwell Friends School
• St. Andrew's Episcopal School (Maryland)
• St. Stephen's and St. Agnes School
• Stone Ridge School

Traditional Rivalries

• St. Stephen's and St. Agnes versus Episcopal (1944-Present)
• The Madeira School versus Foxcroft
• Stone Ridge versus Visitation
• Holton-Arms School versus Madeira
• National Cathedral versus Holton-Arms
• National Cathedral versus Sidwell Friends
• National Cathedral versus St. Agnes
• National Cathedral versus Visitation
• Potomac versus Flint Hill
• Georgetown Day School versus Sidwell Friends
• Holy Child versus Stone Ridge
• The Madeira School versus Holy Child
• The Madeira School versus The Potomac School