The Colonial League is an athletic conference consisting of 14 high schools mostly from the Lehigh Valley portion of eastern Pennsylvania.

The largest 18 schools in the Lehigh Valley and Pocono region compete in the Eastern Pennsylvania Conference, one of the premiere athletic divisions in the nation.

In 1975, ten schools from the Lehigh Valley region of eastern Pennsylvania merged to form the Colonial League.

(Catasauqua was in the Lehigh Valley League aka the LVL, and Palisades had competed as an independent.)

In 2014, Moravian Academy in Bethlehem joined the Colonial League and Notre Dame High School in East Stroudsburg, departed it.