Laron syndrome (LS) is an autosomal recessive genetic disease mainly caused by mutations in the human growth hormone receptor () gene. Previous studies have focused on mutant mice, but compared with LS patients, knockout (KO) mice exhibit differential lipid metabolism. To elucidate the relationship between mutation and lipid metabolism, the role of GHR in lipid metabolism was examined in KO pigs and hepatocytes transfected with si. We observed high levels of free fatty acids and hepatic steatosis in KO pigs, which recapitulates the abnormal lipid metabolism in LS patients. RNAseq analysis revealed that genes related to the fatty acid oxidation pathway were significantly altered in KO pigs. AHR, a transcription factor related to lipid metabolism, was significantly downregulated in GHR KO pigs and sitreated human hepatocytes. We found that AHR directly regulated fatty acid oxidation by directly binding to the promoters of ACOX1 and CPT1A and activating their expression. These data indicate that loss of GHR disturbs the ERK-AHR-ACOX1/CPT1A pathway and consequently leads to hepatic steatosis. Our results established AHR as a modulator of hepatic steatosis, thereby providing a therapeutic target for lipid metabolism disorder.