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Controlling the spray characteristics of a Diesel injector means understanding the internal flow field and the way that cavitation is initiated. Measurements of the internal flow field of an injector are rare, although they provide the appropriate information both on the flow pattern and the initiation of cavitation in order to assist the evaluation of computer predictions of flow and cavitation. The purpose of the current work is to report measurements of the internal flow of a Diesel injector and assess the ability of computational fluid dynamics to predict the flow behaviour. Two-Dimensional Particle Imaging Velocimetry (PIV) technique was employed to measure the internal flow field of a Diesel injector. The experiments were conducted by using 20:1 scale transparent models of different sections upstream of the injection nozzle of a commercial Diesel Injector.