Hydrogen is an interesting fuel for internal combustion engines. It is a versatile fuel that enables high efficiencies and low emissions of oxides of nitrogen (NO), throughout the load range. Computer simulations of hydrogen-fuelled spark ignition engines would facilitate the development of these engines. These necessitate the calculation of the turbulent combustion of hydrogen to track the flame propagation throughout the combustion chamber and resolve in-cylinder pressure and temperature. In order to do this, the laminar burning velocity of the in-cylinder mixture at the instantaneous pressure and temperature is needed. However, there is a scarcity of data in the literature, particularly at engine conditions. This is further complicated by the occurrence of flame instabilities at engine-like pressures, which compromises some of the existing data. This paper discusses the available experimental data and correlations for the laminar burning velocity of hydrogen mixtures, and their deficiencies. One-dimensional chemical kinetic calculations of the laminar burning velocity of mixtures of hydrogen, air and residuals, at engine-like pressures and temperatures are then reported. A correlation is derived for use in hydrogen engine codes and is compared to other correlations presented previously. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.