Preface The LWDA workshop on knowledge discovery, data mining and machine learning (KDML) joins the German machine learning and data mining community. The research workshop concerns any aspects of data mining, knowledge discovery and machine learning with a special focus on graph machine learning and data mining. Furthermore, the workshop encompasses various topics such as deep learning, representation learning, reinforcement learning, text mining, explainable artificial intelligence (XAI), fairness and transparency in machine learning, or machine learning in data streams.