This report maps current knowledge on unlawful influence by organised crime in the Nordic justice sector and the preventive measures in place. A general lack of systematic data, with Sweden as an exception, makes it difficult to assess the full scope of the problem. In Sweden, research documents various forms of unlawful influence, while in the other Nordic countries cases appear more isolated. Unlawful influence is increasingly seen as a key tool of organised crime, often using subtle methods that are hard to detect. Nordic prevention measures include proactive efforts to build organisational resilience and awareness, and reactive protocols for support, reporting and criminal justice responses. Unlawful influence poses a serious and growing threat to Nordic justice authorities, making clear and balanced responses essential to protect both security and openness.