Recent studies show the benefits of lean manufacturing implementation in agri-food industries to improve operational and environmental performance. However, only a restricted number of studies have addressed the implementation of lean practices in food companies located in developing countries. This study aims to assess the current implementation status of lean practices in Moroccan agri-food companies, particularly small and medium-sized enterprises, and to examine their impact on operational and environmental performance. Responses from 45 agri-food companies were collected through a questionnaire. The results show that the degree of implementation of lean practices in the Moroccan food industry is generally average. On the other hand, some lean practices are implemented more frequently compared to others., e.g. customer involvement, employee involvement, supplier involvement and total productive maintenance are the most implemented. On the other hand, pull and setup are not used very much. The findings also demonstrate the positive impact of lean practices on both operational and environmental performance.