This is a protocol for a Cochrane Review (Intervention). The objectives are as follows:

The primary aim of this review is to determine the effectiveness of implementation strategies for policies, practices or programmes that aim to improve health behaviours or reduce unhealthy behaviours commonly associated with risk factors for chronic disease in the workplace. Specifically, this review will target interventions that address diet, physical inactivity, obesity, risky alcohol use and tobacco use.

In addition, this review will determine:

• the effectiveness of implementation strategies on health behaviour outcomes (nutrition, physical activity, obesity, alcohol use and smoking);

• the cost‐effectiveness of these strategies;

• the existence of adverse outcomes resulting from the implementation of these strategies.