This study focuses on identifying the critical barriers/difficulties and exploring the roots of barriers/difficulties for successful Lean implementation at manufacturing companies in Vietnam. The literature review and in-depth interviews are applied in this study. The literature review is done to review and to obtain experiences of the inhibitors of Lean Implementation from previous studies. An in-depth interview is conducted with eight experts of eight manufacturing companies deployed Lean to explore and identify the critical barriers/difficulties for Lean implementation successfully. As a result, it finds that seven key barriers inhibiting the successful Lean implementation come from the leadership
the employees
the workplace
resources
operation process
the integration with customers
and from the integration with suppliers. These challenges are not easy and take a lot of time to overcome, though, this study provides helpful advice for business in Vietnam who has plans to follow Lean implementation in looking back to the company and restructuring strategies, objectives so that Lean implementation process would be more efficient and more open.