Short Titles Act (with its variations) is a stock short title used for legislation in Ireland and the United Kingdom which retroactively confers short titles on a large number of earlier pieces of legislation.

The Bill for an Act with this short title will have been known as a Short Titles Bill during its passage through Parliament.

Halsbury's Laws said that Short Titles Acts are law reform Acts.

[1] In modern times, an Act will authorize a short title to refer to itself, and occasionally additional or alternative short titles are provided, as for example the Senior Courts Act 1981.