Title: ALMA detected overdensity of sub-mm sources around WISE-selected z~2 dusty quasars Abstract: We study the environments of 49 WISE-selected hyper-luminous, heavily obscured, z~2 quasars. The fields were observed with ALMA in Band 7. We find that 17 of the 49 WISE sources show additional sub-mm galaxies within the ALMA primary beam. The source counts measured from these fields are ~10 times expectations for unbiased regions, suggesting these WISE quasars reside in highly clustered environments.