Fiber-reinforced composites have become a crucial element of modern lightweight structures due to their excellent stiffness-to-weight ratio. Unlocking the true potential of these materials requires optimizing the structural geometry as well as fiber orientations. However, available geometric design tools, such as topology optimization, primarily address isotropic materials, where stiffness tailoring by fiber orientation control is mainly performed for standard geometries such as panels. Recent developments in the structural design methods and additive manufacturing technologies have triggered a paradigm shift toward combined optimization of geometry and fiber paths. Despite boosting attainable structural performance levels, this approach brings various requirements such as managing a multitude of variables with different physical meanings, preventing numerical instabilities, and ensuring the manufacturability of output designs. To address these challenges, the development of novel design strategies is critical. This mini-symposium invites researchers from academia and industry to share their recent findings and insights regarding the design of lightweight fiber composites, considering both form and anisotropy of the structures. Studies concerning both classical constant-stiffness laminates and variable-stiffness composites with curved fibers are welcome. Contributions may involve different geometric design techniques such as density-based, discrete-variable, and component-wise topology optimization. Sequential, collaborative, and concurrent geometry and fiber orientation optimization approaches are all within the scope. In addition to prevalent compliance minimization, other potential design objectives of interest include, but are not limited to, maximization of buckling load, eigenfrequency gaps, and damage resistance. Works involving reliability-oriented, metamodel-based, and/or AI-assisted optimization techniques are also encouraged. Studies centering on manufacturability, experimental testing, and industrial applications are of great relevance as well. The mini-symposium will offer a unique opportunity for researchers working on lightweight design methodologies to connect with peers in the field and stay informed about the latest developments. We aim to facilitate progress in the design of composite components and the adoption of new techniques in real-world problems by providing a platform for interdisciplinary discussions and knowledge exchange.