Employees spend a large proportion of their time at work and typically consume a third of their total calories during the working day. Research suggests that the workplace environment can affect employees' eating behaviours, leading to various related health consequences. This systematic review aimed to identify and synthesize the evidence surrounding factors influencing eating behaviours within an office-based workforce. The literature search was restricted to studies published in English between January 2008 and April 2018. A total of 5,017 articles were screened and assessed for eligibility, of which 22 articles (n=23 studies) were included in the review. All included studies were subjected to quality assessment and were summarized into groups (themes) of "factors" affecting any aspect of eating behaviour at work. The findings revealed a number of factors influencing eating behaviours at work relating to the job role, workplace food environment, and social aspects of the office-based workplace. Most of the existing research implies the office-based workplace has a negative influence on eating behaviours. The findings of this review provide an evidence based, comprehensive summary of the possible determinants of eating behaviours in the workplace, which may help researchers to identify factors that are potential targets for intervention.