The Southern African Heads of Independent Schools Association (SAHISA) is a professional membership body for heads of independent schools. Any head of an ISASA member school may apply to become a member of SAHISA.

SAHISA is a constituent member of ISASA, and the SAHISA Chair is represented on the ISASA Executive Committee.

In addition to the national office-bearers, SAHISA also has regional chairs and committees in each of the five ISASA regions.

ISASA and SAHISA together present the annual heads' Conference.