The Statute of the International Court of Justice stipulates that judges shall exercise their powers impartially. We question the practicability of this statement and examine whether the voting pattern of the judges are biased. In this light, empirical research is conducted on cases adjudicated from 2005 to 2016. We find strong evidence that (1) judges favour their home States or appointing States; and (2) judges favour States that speak same majority language with their home States.