Composites at Lake Louise (CALL) is a unique forum for exploring the state-of-the-art and future challenges pertaining to complex materials systems, ranging from structural composites to multi-functional materials used in device technological, engineering, and biomedical applications. CALL strives to bring together researchers with diverse and multi-disciplinary expertise in an inspiring venue nestled in the spectacular Canadian Rockies. Here invitees share, discuss, and learn about the latest innovations, discoveries, and scientific quests. For CALL 2019, we invite the submission of abstracts covering a broad range of crosscutting topics, including the design, formulation, synthesis, fabrication, characterization, and performance assessment of complex materials systems. The objective of the CALL conference is to assemble leading experts from diverse disciplinary fields who represent emerging fields of study that rely on innovative deployments of complex materials systems and novel materials design concepts for achieving next generation functionality. The conference promotes immersive deliberations with the intents to accelerate forward thinking in current focal areas of science and technology related to complex materials systems and composites. These areas could include materials for structurally integrated energy conversion and storage, more sustainable processing and materials options, sensing and health monitoring, mechanics of complex systems, and materials design for biomedical applications. At this time, comprehensive submissions are encouraged with the intent of identifying arising materials challenges and emerging fields of study.