The development of biomarkers that can predict viral rebound following discontinuation of antiretroviral therapy (ART) in HIV-1-infected humans would be an important advance in HIV-1 cure research. In a prior study, we initiated ART in 20 rhesus macaques on days 0, 1, 2, and 3 following SIVmac251 infection prior to plasma viremia. Following 6 months of suppressive ART, we discontinued ART and observed viral rebound in 9 of 20 animals. Here we show that transcriptomic and proteomic signatures of inflammation and immune activation in peripheral blood during ART suppression predicted viral rebound following ART discontinuation. Higher levels of proinflammatory and cellular immune activation pathways, including TNF, IL-1, IL-6, monocyte, and T cell activation signaling pathways, correlated with viral rebound following ART discontinuation. Immune modulatory IL-10 and TGF-beta signaling also correlated with viral rebound. These data suggest that persistent upregulation of inflammatory and immune activation pathways despite suppressive ART represents a peripheral blood biomarker signature of the rebound-competent viral reservoir. The development of interventions that target the viral reservoir and modulate this signature may open new avenues in HIV-1 cure research.