The information demands of external stakeholders of organizations concerning compliance management increased within the last years. Effective communication about implemented compliance processes has the potential to increase or maintain a positive image and a good reputation of a corporation. The aim of this master thesis is to develop an external compliance communication concept for Energie Steiermark AG, based in Austria, including recommendations for action for the implementation of the communication concept in the subsidiary STEFE SK which is located in Slovakia. For this purpose, a thorough analysis of existing literature about compliance management, external compliance communication, and the legal framework of compliance management and non-financial reporting of Austria and Slovakia has been conducted to identify the planning steps that have to be considered in the development of an external compliance communication concept. Based on the findings of the literature review, a theoretically valid external compliance communication concept has been crafted. Furthermore, a primary and secondary market research based on a qualitative approach have been conducted to investigate the current state of external compliance communication of stock-listed Austrian organizations with subsidiaries in Slovakia or other Central and Eastern European Countries. In the practical section of this master thesis, the external compliance communication concept for Energie Steiermark has been developed based on the findings of the literature review and the findings of the market research. The communication concept involves the following planning phases: situation analysis, communication objectives, target group segmentation, communication strategy, positioning, communication tactics and controlling. The last chapter provides recommendations for action for the implementation of the concept in the Slovakian subsidiary.