Introduction Data extract from Landolt-Boernstein IV/25: Viscosity of Pure Organic Liquids and Binary Liquid Mixtures 1.1 Selection of data This supplement updates Landolt-Boernstein’s New Series Group IV (Physical Chemistry) Volume 18, Vi- osity of Pure Organic Liquids and Binary Liquid Mixtures, published in two subvolumes in the years 2001 and 2002 [2001WOH1, 2002WOH1]. The update provides experimental data published in the years 2000 to 2006. The ?nal date for including data was December, 31st, 2006. Specialization and selection of data for this new update follows the intentions of the original volume. The focus is on non-electrolyte systems, and only data for pure liquids and binary liquid mixtures at normal pr- sure (or in some single cases at saturation vapor pressure) were taken into account for this volume. For m- tures, this data collection is restricted to binary liquid mixtures, i.e. no ternary systems and also no solutions of any solids, salts, electrolytes, polymers are included here. Surfactant solutions or micellar systems in water or other ?uids were not considered either. At least, also molten metals and metallic alloys, molten salts, molten glasses and other high-temperature melts were not taken into account. As the amount of data collected between 2000 and 2006 exceeds the available space for printing by far, the volume has an electronic version containing additional data which is available on www.landolt-boernstein.com.