Lean Manufacturing and JIT links with suppliers are methods to improve operational performances (e.g. efficiency and on-time delivery). Recently, researchers have begun to debate on the relationship between Lean Manufacturing, operational performances and JIT links with suppliers. This paper aims to investigate this relationship. An international survey was used to examine the research questions. Based on a sample of 200 companies, our analyses demonstrate that JIT links with suppliers positively moderate the impact of Lean Manufacturing on on-time delivery performance