Photorealistic 3D head avatars will play a crucial role in future computer games, visual effects, movie production, and virtual telepresence. In this workshop, we bring together leading academic researchers and industry experts to discuss the technology behind 3D head avatars, current applications, and future trends. In particular, we focus on two key desiderata of 3D head avatars: achieving the highest possible rendering quality and controlling the avatar with a driving signal. To this end, the workshop hosts a challenge on the NeRSemble 3D Head Avatar Benchmark. Challenge participants are invited to submit their methods for two tasks: dynamic novel view synthesis on heads, and monocular FLAME-driven 3D head avatar reconstruction. The authors of the best-performing submission will receive a GPU prize and present their method alongside invited speakers in the workshop.