Head Start Centers of Excellence Act of 2003 - Amends the Head Start Act to direct the Secretary of Health and Human Services to establish a program for: (1) designating up to 200 exemplary Head Start agencies as Centers of Excellence in Early Childhood; and (2) making bonus grants to such centers to provide Head Start services to additional eligible children, and perform specified related activities.
Directs the Secretary to make grants to: (1) States to enable them to establish State Councils for Excellence in Early Childhood to work with the State Head Start Office of Collaboration; and (2) an independent organization to conduct research on the ability of the centers of excellence to improve the school readiness of children receiving Head Start services, and to positively impact school results in the earliest grades.