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Receptor activity-modifying proteins (RAMPs) can form complexes with G protein-coupled receptors (GPCRs) and regulate their cellular trafficking and pharmacology. RAMP interactions have been identified for about 50 GPCRs, but only a few GPCR-RAMP complexes have been studied in detail. To elucidate a complete interactome between GPCRs and the three RAMPs, we developed a customized library of 215 Dual Epitope-Tagged (DuET) GPCRs representing all GPCR subfamilies. Using a multiplexed suspension bead array (SBA) assay, we identified 122 GPCRs that showed strong evidence for interaction with at least one RAMP. We screened for native interactions in three cell lines and found 23 GPCRs that formed complexes with RAMPs. Mapping the GPCR-RAMP interactome expands the current system-wide functional characterization of RAMP-interacting GPCRs to inform the design of selective GPCR-targeted therapeutics., Competing Interests: M.U. is a cofounder of Atlas Antibodies AB, the commercial distributor of some of the Abs used in this study. J.M.S. acknowledges a relationship with Atlas Antibodies AB. J.M.S. has, unrelated to this study, conducted contract research with Luminex Corp., received travel and accommodation expenses from Luminex Corp., and received speaker fees from Roche Diagnostics. The other authors declare that they have no competing interests.