The International Court of Justice (ICJ) has jurisdiction over disputes between nations and has decided dozens of cases since it began operations in 1946. Its proponents argue that the ICJ decides cases impartially. Critics argue that members of the ICJ vote the interests of the states they designate. Prior empirical scholarship is ambiguous. We test the charge of bias using statistical methods. We found strong evidence that (1) judges favor the states that appoint them and that (2) judges favor states whose wealth level is similar to that of ...