The multivolume set LNAI 14169 untilampampnbsp 14175 constitutes the refereed proceedings of the European Conference on Machine Learning and Knowledge Discovery in Databases ECML PKDD 2023 which took place in Turin Italy in September 2023.The 196 papers were selected from the 829 submissions for the Research Track and 58 papers were selected from the 239 submissions for the Applied Data Science Track.ampampnbspThe volumes are organized in topical sections as followsPart IampampnbspActive LearningampampnbspAdversarial Machine LearningampampnbspAnomaly Detection Applications Bayesian Methods Causalityampampnbsp ampampnbspClustering.Part IIampampnbspComputer Vision Deep Learning Fairness Federated Learning Fewshot learning Generative Models Graph Contrastive Learning.Part IIIampampnbspGraph Neural NetworksampampnbspGraphs InterpretabilityampampnbspKnowledge Graphs Largescale Learning.Part IVampampnbspNatural Language Processing NeuroSymbolic Learning Optimization Recommender Systems Reinforcement LearningampampnbspRepresentation Learning.Part VampampnbspRobustness Time Series Transfer and Multitask Learning.Part VIampampnbspApplied Machine Learning Computational Social Sciences Finance Hardware and Systems Healthcare ampamp Bioinformatics HumanComputer Interaction Recommendation and Information Retrieval.Part VIIampampnbspSustainability Climate and Environment.ampampnbspTransportation ampamp Urban Planning.ampampnbspDemo.