Internal audit is an important part of any ISO 45001:2018 or OHSAS 18001 (Operational Health and Safety Management System), regardless that you do it by yourself or by your ISO 45001 consultant. The internal audit can measure how your organization has dealt with risk and hazards, provide a dynamic measure as to whether continual improvement has taken place or not. The conduct of OH&S MS or so-called safety audit can impact the overall performance of your system and the ultimate well-being of your employees. It is therefore very important for an organization’s internal audits must be accurate and thorough, and while elements need to be focused on your type of business and its hazards and risks, there are also parts of the OHSAS 18001 standard itself that the internal audit needs to take recognition of. Knowing this, it would seem to make sense to prepare an internal audit checklist that can be used and adapted for the internal audit cycle within your OH&SMS. So, what considerations do we need to make when compiling this?