This document provides information on international labour standards related to occupational safety and health (OSH) established by the International Labour Organization (ILO). It summarizes key ILO conventions on OSH including Convention 155 from 1981 that established a framework for national OSH systems focused on prevention, Convention 161 on occupational health services, and Convention 187 from 2006 that promotes national policies and programs to improve OSH. The document also reviews the historical development of ILO standards on OSH and concepts regarding health, working conditions, and prevention central to the conventions.