This chapter addresses flow-induced vibrations occurring in fluid machinery with a focus on vibration of blades and cascades, vibration of rotors partially filled with fluid, and vibrations induced by confined flows. Fluid machinery often encounter serious vibration problems. For example, blades, which are critical components, may fail due to forced vibration caused by the wake from preceding blades or inlet distortion. Destabilizing forces generated by annular flow in seals may cause large-amplitude vibration of the rotary shaft. In some cases, production downtime has been caused by unstable vibration of rotors partially filled with fluid, including automatic washing machines and centrifuges. This chapter includes sections on the vibration phenomena above. The underlying mechanisms are discussed in detail followed by a presentation of evaluation methods and preventive measures.