The strengths and ductility of electrochemically deposited metals generally are different from those of the corresponding ones produced by other means. The difference is due to the growth mechanism of the deposits, that they can contain substances which are unstable at elevated temperature and the presence of various crystal defects. The effects on the mechanical properties of electrodeposits of dislocations, twins, voids, codeposited foreign materials, surface crevices, subgrain and grain boundaries, internal stresses and textures are discussed. The ways polarization, current form, solution temperature and agitation affect the mechanical properties of deposits are reviewed. A discussion of the relationships between hardness, the tensile and the fatigue properties is also included. Annealing effects and those of special structures on the properties are also considered.