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Reanalysis is a scientific method to combine observations and models for developing a comprehensive record of how weather and climate are changing over time. A reanalysis dataset typically extends over several decades or longer, and covers the entire globe from the Earth's surface to well above the stratosphere. Reanalysis products are used extensively in climate research and services, including for monitoring and comparing current climate conditions with those of the past, identifying the causes of climate variations and change, and preparing climate predictions. Recently, the National Oceanic and Atmospheric Administration (NOAA), National Aeronautical and Space Administration (NASA), European Centre for Medium-Range Weather Forecasts (ECMWF), and Japanese Meterological Agency (JMA) have produced new reanalysis datasets that, in total, span 1871 to present. It is crucial to our scientific understanding of climate variability and change that these new datasets be validated and compared with each other and with the underlying observations. International working groups of the Global Climate Observing System (GCOS, the climate element of the Global Earth Observing System of Systems) and the World Climate Research Program, and the Atmospheric Circulation Reconstruction over the Earth (ACRE) initiative need a community portal to exchange quickly and disseminate publicly results of such intercomparisons. NOAA's own mission and strategic goals regarding reanalyzes, as well as its leading role in the US Global Change Research Program, GCOS, WCRP, and ACRE, make NOAA the logical and obvious choice to serve a website dedicated to improving understanding of the international reanalysis datasets, including those recently generated by NOAA, the 20th Century Reanalysis and Climate Forecast System Reanalysis. The new website "reanalyses.org" will serve as a central portal for Reanalysis Intercomparison and Observations (RIO) by NOAA, NASA, ECMWF, JMA, and national and international scientists. The website should be outside the "noaa.gov" domain. It will help NOAA and the international scientific community to improve the climate science and services that reanalyzes underpin. NOAA strategic plans and US Global Climate Research Program plans to which NOAA Office of Atmospheric Research and the new NOAA Climate Service will respond specifically call for advances in understanding reanalysis datasets. The RIO will coordinate with the NOAA Climate Services portal to make the intercomparison and observation documentation public.