Head Boy and Head Girl (colloquially, Head Prefect) are terms commonly used in the British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 education system

Education in the United Kingdom

Education in the United Kingdom is a devolved matter with each of the countries of the United Kingdom having separate systems under separate governments: the UK Government is responsible for England, and the Scottish Government, the Welsh Government and the Northern Ireland Executive are...

, and in private school

Private school

Private schools, also known as independent schools or nonstate schools, are not administered by local, state or national governments; thus, they retain the right to select their students and are funded in whole or in part by charging their students' tuition, rather than relying on mandatory...

s throughout the Commonwealth

Commonwealth of Nations

The Commonwealth of Nations, normally referred to as the Commonwealth and formerly known as the British Commonwealth, is an intergovernmental organisation of fifty-four independent member states...

.
In some British schools the student body (or the headteacher) appoints or elects a pupil or pupils as Head Boy(s) and/or Head Girl(s). A Head Boy/Girl is usually responsible for representing the school at events, and therefore must be able to make public speeches.