Purpose. The purpose of this paper was to examine leadership practices in effective schools located in economically disadvantaged areas of three Canadian provinces: Ontario, Québec, and New Brunswick. Research Design. Our study was conducted in five successful schools selected on the basis of student outcomes on province-wide standardized exams, as well as on some risk factors such as rural area, low socioeconomic level, and proportion of Francophones (Ontario and New Brunswick). To increase the study’s validity, we used triangulation and various data sources: (1) individual interviews; (2) observation of school principals; (3) field documentation; (4) student essays; (5) internal school documents such as mission statement, rules, and directives. Participants. Participants included Department of Education heads and school board administrators, school principals and vice principals, teachers, school counsellors, educational psychologists, parent school board members, and students. Findings. Results show that leadership practices in effective schools can be grouped together around five dimensions: establishing goals and expectations; strategic resourcing; curriculum planning, coordination, and evaluation; promoting and participating in teacher supervision and development; ensuring order and support.