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The size and shape of polymer materials is becoming an increasingly important property in accessing new functions and applications of nano‐/microparticles in many scientific fields. New synthetic methods have allowed unprecedented capability for the facile fabrication of anisotropic and shape‐defined nanomaterials. Bottom‐up approaches including: emulsion polymerization techniques, amphiphile self‐assembly, and polymerization‐induced self‐assembly, can lead to polymer particles with precise dimensions in the nanoscale. Top‐down methods such as lithographic templating, and 3D printing, have increased the access to unique particle shapes. In this review, these recent developments are appraised and contrasted, with future research directions providing that focus on biomedical applications. Finally, the opportunity available for synergistic combinations of top‐down and bottom‐up fabrication approaches in realizing previously unattainable architectures and material properties is highlighted.