3. c. 146) was an Act of the Parliament of the United Kingdom of Great Britain and Ireland which modified the penalty for high treason for male convicts.

Originally the mandatory sentence for a man convicted of high treason (other than counterfeiting or coin clipping) was hanging, drawing and quartering.

The 1814 Act also permitted the King to authorise the use of an alternative method, beheading, which was not abolished until 1973 (although obsolete long before then).

The last execution under the Act was of William Joyce in 1946, for assisting the Third Reich during the Second World War.

Note that hanging, drawing and quartering was never the penalty for counterfeiting or clipping coins (which was high treason until 1832).