Rupture of hepatocellular carcinoma (HCC) is a fatal complication. Intraperitoneal metastasis after rupture of HCC is rare. We report a case of diffuse intraperitoneal metastases after rupture of HCC. A previously asymptomatic 32-year-old man was admitted because of massive ascites due to ruptured HCC. Poor liver reserve limited the therapeutic options. Transarterial chemoembolization was performed to stop tumor bleeding. Abdominal computed tomography demonstrated multiple large peritoneal metastases 3 months after the rupture episode. Echo-guided fine needle aspiration from the suprapubic area was performed. Cytology was positive for HCC. It is rare for HCC to develop intraperitoneal metastases in as short as 3 months.