Optomechanics is defined as the maintenance of the shape and position of the surfaces of an optical system. Optical engineering is the control of light by the interaction of light with surfaces. Optomechanics is associated with the design and support of the surfaces of optical systems, normally under a wide variety of conditions. This brief introduction includes a discussion of the development of optomechanics as an engineering discipline. Although optomechanics is important in the design of any optical system, recognition of the field is relatively recent, with the first professional optomechanics conference being held in 1980. A significant lack until now is the absence of a textbook on optomechanics; this book is intended to meet this need and serve as a reference for self-study by working professionals.