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Fat deposition is critical to pork quality. However, the mechanism of fat deposition remains to be elucidated. Circular RNAs (circRNAs) are ideal biomarkers and are involved in adipogenesis. Here, we investigated the effect and mechanism of circHOMER1 on porcine adipogenesis in vitro and in vivo. Western blotting, Oil red O staining, and HE staining were used to assess the function of circHOMER1 in adipogenesis. The results showed that circHOMER1 inhibited adipogenic differentiation of porcine preadipocytes and suppressed adipogenesis in mice. Dual‐luciferase reporter gene, RIP, and pull‐down assays demonstrated that miR‐23b directly bound to circHOMER1 and the 3′‐UTR of SIRT1. Rescue experiments further illustrated the regulatory relationship among circHOMER1, miR‐23b, and SIRT1. Conclusively, we demonstrate that circHOMER1 plays an inhibitory role in porcine adipogenesis through miR‐23b and SIRT1. The present study revealed the mechanism of porcine adipogenesis, which may be helpful to improve pork quality. [ABSTRACT FROM AUTHOR]