**Our apologies if you receive multiple copies of this CFP** *SUBMISSION SYSTEM IS OPEN FOR* for the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML PKDD 2021), Bilbao, Spain (ONLINE). https://2021.ecmlpkdd.org/ *SCOPE AND MOTIVATION* This event is the premier European machine learning and data mining conference. Theoretical and applied contributions on all topics related to machine learning, knowledge discovery and data mining are invited. *IMPORTANT DATES* -Abstract submission deadline: March 26th 2021 -Paper Submission Deadline: April 2nd, 2021 -Author notification: June 18th, 2021 -Conference: 13-17 September 2021 (ONLINE) For more information on submitting a paper to Research or Applied Data Science Track of ECML PKDD 2021 please visit https://2021.ecmlpkdd.org/?page_id=1599 Other events at ECML PKDD: -journal track (last submission dl May 02) https://2021.ecmlpkdd.org/?page_id=1341 -PhD forum (submission dl June 21) https://2021.ecmlpkdd.org/?page_id=1591 -discovery challenge https://2021.ecmlpkdd.org/?page_id=1610 -tutorials and workshops (proposals due March 26) https://2021.ecmlpkdd.org/?page_id=1603 *ORGANIZING COMMITTEE* Jose A. Lozano, Basque Center for Applied Mathematics, Spain Nuria Oliver, Vodafone and Data-Pop Alliance, UK Fernando Perez-Cruz, Swiss Data Science Center, Switzerland Stefan Kramer, Johannes Gutenberg Universitat Mainz, Germany Jeese Read, Ecole Polytechnique, France Yuxiao Dong, Facebook AI, Seattle Nicolas Kourtellis, Telefonica Research, Barcelona, Spain Barbara Hammer, Bielefeld University, Germany Sergio Escalera, Universitat de Barcelona, Spain Heike Tratmaun, Universitat Munster, Germany Annalisa Appice, Universita degli Studi di Bari, Italy Jose A. Gamez, Universidad de Castilla-La Mancha, Spain Inaki Inza, University of the Basque Country, Spain Alexander Mendiburu, University of the Basque Country, Spain Santiago Mazuelas, Basque Center for Applied Mathematics, Spain Aritz Perez, Basque Center for Applied Mathematics, Spain Sophie Burkhardt, Johannes Gutenberg Universitat Mainz, Germany Julia Sidorova, Universidad Complutense de Madrid, Spain Alipio Jorge, University of Porto, Portugal Yun Sing Koh, University of Auckland, New Zealand Tania Cerquitelli, Politecnico di Torino, Italy Jeronimo Hernandez, Spanish National Research Council, Spain Zahra Ahmadi, Johannes Gutenberg Universitat Mainz, Germany Paula Brito, Universidade do Porto, Portugal Dino Ienco, Univ. Montpellier, France We look forward to welcoming you in Bilbao.