Crime Prevention through Environmental Design (CPTED) is a method of reducing crime through the design and manipulation of the built environment. Based upon the New Opportunity Theories of crime, CPTED focuses upon blocking opportunities for criminal behaviour through subtle techniques to maximise informal surveillance, territoriality and guardianship, to minimise through movement and to set standards of physical security that are proportionate to crime risk. This chapter will discuss the principles of CPTED and the theories from which it evolved, before exploring how CPTED is applied internationally in terms of policy, guidance and practice. Examples include Chile, Mexico, and Brazil, as well as countries with more established processes of implementing CPTED within the planning process (England and Wales, Netherlands and Australia). Evidence regarding effectiveness will be presented and consideration will be given to the extent to which principles, practice and procedure can be transferred to different countries and cultures