In this chapter we will investigate the design of vibratory accelerometers. Their underlying physical principle is that the transverse resonant frequency of a string or bar depends on the tensile stress, and the stress can be made a function of acceleration by fixing a proof mass to the string or bar. We will examine the design of two versions of vibrating beam accelerometers (VBAs) and describe their performance models. We will also consider a recent micromachined silicon version.