This report maps current enforcement and compliance measures and practices in Ontario’s regulation of employment, particularly as they relate to precarious employment. It evaluates the effectiveness of Ontario’s enforcement regimes, focusing on Employment Standards (ES) and Occupational Health and Safety (OHS) legislation, and sets these regimes in the context of those operating in jurisdictions across and outside Canada. Through this process, it identifies and evaluates potential reforms to improve regulatory effectiveness, particularly for workers in precarious jobs. The central argument is that there are fundamental deficiencies in both of these enforcement regimes: each, albeit in different ways, is out of step with the realities of the contemporary labour market and each demands more proactive approaches to regulation combined with, where appropriate, innovative reactive and voluntary measures that are embedded in strong public enforcement.