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This dataset contains grain size records from three Integrated Ocean Drilling Program core sites (U1345, U1343, and U1339) in the Bering Sea. These records are used to determine the effectiveness of different grain size parameters as proxies for sediment transport, current strength, and primary productivity in the Bering Sea during a past warm interval (Marine Isotope Stage 11, 424-374 thousand years ago (ka)). Grain size is measured using a laser diffraction particle size analyzer (Malvern Mastersizer 3000), and is reported for bulk sediments, and for the terrigenous fraction only. The raw dataset provided by the Malvern software includes the volume % of grains in 109 bin sizes, as well as the 10th (Dx10), 50th (Dx50) and 90th (Dx90) percentiles. We also provide the volume distribution of grains in the following size fractions: clay (less than 2 micrometers (μm)); silt (2-63 μm); sand (63-2000 μm); gravel (greater than 2000 μm); ice-rafted debris (greater than 150 μm; greater than 250 μm), and sortable silt (10-63 μm). Additional grain size parameters, including mean size, sorting and skewness, are calculated in GRADISTAT.