The paper aims to identify, describe and analyse knowledge risksorganisations might face and based on this, proposes a taxonomy of knowledgerisks. To achieve this goal, a literature review was conducted. After the analysisof the existing material, it was possible to divide knowledge risks into twocategories: internal (originating from the inside of the organisation) andexternal (originating from the outside of the organisation). Some of thepresented knowledge risks appear to have an incidental character (e.g.,knowledge spillover, knowledge leakage or knowledge waste), while others areof a continued nature (e.g., knowledge attrition or risks connected withknowledge work).Our study is not only timely but also relevant for initiating increased andrigorous research activities in the field of knowledge risks. The proposedtaxonomy will also help organisations in concentrating on their crucialknowledge and in finding ways to prevent or reduce these risks.