Information security, information management systems and more specifically information classification are important parts of an organisations information security. More and more information is being processed each day, and needs to be secured. Without proper information classification guidelines in place and lacking research within the subject, organisations could be vulnerable to attacks from third parties. This project displays a list of best practices found within information classification guidelines published online by different organisations. Out of 100 reviewed documents, 30 included information classification guidelines, and when analysed with a thematic analysis provides best practices within information classification.