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Renal fibrosis is a common pathological hallmark of chronic kidney disease, and no effective treatment is clinically available to manage its progression. Astaxanthin was recently found to be anti-fibrotic, but its effect on renal fibrosis remains unclear.C57BL/6J mice were subjected to unilateral ureteral obstruction and intragastrically administered astaxanthin. Histopathology and immunohistochemistry were performed to evaluate renal fibrosis. Flow cytometry was used to examine lymphocyte accumulation in the fibrotic kidneys. Western blotting, real-time qPCR, and immunofluorescence were performed to cover the underlying mechanism concerning astaxanthin treatment during renal fibrosis.Oral administration of astaxanthin effectively alleviates renal fibrosis in mice. In vitro, astaxanthin inhibited fibroblast activation by modulating Smad2, Akt and STAT3 pathways and suppressed epithelial-to-mesenchymal transition in renal tubular epithelial cells through Smad2, snail, and β-catenin. Moreover, astaxanthin significantly induced the rapid accumulation of CD8These findings highlight the beneficial effect of astaxanthin on fibroblast activation, epithelial-to-mesenchymal transition, and CD8These data indicate that astaxanthin could serve as a therapeutic strategy to treat renal fibrotic conditions.