Which article deals with the judicial branch of government?

Article III of the Constitution of the United States deals with the judicial branch of government.

Explanation:

Article III describes the judicial system, including the United States Supreme Court. The article requires that there be a court called the Supreme Court. Congress, at its discretion, may create lower courts, whose judgments and orders may be reviewed by the Supreme Court. Article III also requires the participation of a jury in all criminal cases, defines the crime of treason, and instructs Congress to establish a punishment for it.