Kilbeggan was a constituency represented in the Irish House of Commons from 1612 to 1800.
The borough was incorporated by James I by a Charter dated 27 February 1612.
The charter conferred upon the elected portreeve and burgesses the right to return two Members to Parliament.
In the Patriot Parliament of 1689 summoned by James II, Kilbeggan was represented by two members.
A sum of £15,000 was paid at the 1801 Union, to Gustavus Lambart as compensation for the loss of the elective franchise.