The collection contains 590 pivotal papers on optomechanical design, selected for their usefulness to designers and optical instrument developers. Topical categories: Optomechanical properties of materials; optomechanical and thermal design and analysis; shock and vibration control; tracking and line-of-sight stabilization; optical component design and mounting; mechanisms and MOEM devices; tolerancing, specifications, and standards; fabrication, assembly, alignment, and testing.