Fluid Structure Interaction 2009 is the fifth conference in this successful series. The conference brings together international experts from various application fields to exchange information and knowledge on fluid structure interaction problems, giving them the opportunity to interact with one another and to provide valuable cross breeding of ideas and techniques. Papers presented at the conference cover the following areas: Computational Methods; Experimental Studies and Validation; Flow Induced Vibrations; Acoustics; Hydrodynamic Forces; Offshore Structures; Response of Structures including Fluid Dynamics; Fluid Pipeline Interactions.