The QuIESCENT Arctic workshop (Quantifying the Indirect Effect: from Sources to Climate Effects of Natural and Transported Aerosol in the Arctic) will take place April 4 to 5, 2019, in Cambridge, England.  The QuIESCENT Arctic program aims to identify the key challenges in quantifying the indirect effect in the Arctic, providing a cross-disciplinary bridge between aerosols and clouds, physicists and chemists, and observations and models.