This is a list of cases reported in volume 225 of United States Reports, decided by the Supreme Court of the United States in 1912.

The Supreme Court is established by Article III, Section 1 of the Constitution of the United States, which says: "The judicial Power of the United States, shall be vested in one supreme Court .

The size of the Court is not specified; the Constitution leaves it to Congress to set the number of justices.

When the cases in volume 225 were decided the Court comprised the following nine members: Hyde v. United States, 225 U.S. 347 (1912), is a criminal case in which the Supreme Court interpreted attempt.

[2]: 688  The Court held that for an act to be a criminal attempt, it must be so near the result that the danger of its success must be very large.