The following legal framework adopted by the Council of Europe is relevant to the activities conducted by the Investigation Division of the DIO.

• Charter of the Directorate of Internal Oversight
• Staff Regulations and staff rules (entered into force on 1 January 2023) and previous Staff Regulations (in force until 1 January 2023) and secondary legislation for its implementation
• Rule on investigations (entered into force on 1 January 2023)
• Speak Up: Council of Europe Policy on reporting wrongdoing and protection from retaliation (entered into force on 1 June 2023)
• Code of conduct 
• Policy on Respect and Dignity in the Council of Europe
• Policy Statement by the Secretary General on Awareness and Prevention of Fraud and Corruption
• Rule No. 1327 of 10 January 2011 on awareness and prevention of fraud and corruption (in force until 1 January 2023)
• Instruction No. 65 of 28 June 2016 on Investigations (in force until 1 January 2023)