Brecon was a parliamentary constituency in Wales which returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom and its predecessors, from 1542 until it was abolished for the 1885 general election.

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From its first election in 1542 until some time before 1715, the constituency consisted of a number of boroughs within the historic county of Brecknockshire or Breconshire in Wales. From then until 1885 the seat represented the parliamentary borough of Brecon alone. The constituency should not be confused with the county constituency of Breconshire, which existed from the sixteenth century until 1918.

On the basis of information from several volumes of the History of Parliament, it is apparent that the history of the borough representation from Wales and Monmouthshire is more complicated than that of the English boroughs.

The Laws in Wales Act 1535 (26 Hen. 8. c. 26) provided for a single borough seat for each of 11 of the 12 Welsh counties and Monmouthshire. The legislation was ambiguous as to which communities were enfranchised. The county towns were awarded a seat, but this in some fashion represented all the ancient boroughs of the county as the others were required to contribute to the member's wages. It was not clear if the burgesses of the contributing boroughs could take part in the election. The only election under the original scheme was for the 1542 parliament. It seems that only burgesses from the county towns actually took part. The Parliament Act 1543 (35 Hen. 8. c. 11) confirmed that the contributing boroughs could send representatives to take part in the election at the county town. As far as can be told from surviving indentures of returns, the degree to which the out boroughs participated varied, but by the end of the sixteenth century all the seats had some participation from them at some elections at least.

The original scheme was modified by later legislation and decisions of the House of Commons (which were sometimes made with no regard to precedent or evidence: for example in 1728 it was decided that only the freemen of the borough of Montgomery could participate in the election for that seat, thus disenfranchising the freemen of Llanidloes, Welshpool and Llanfyllin).

In the case of Breconshire, the county town and principal borough was Brecon. One ward of the principal borough was an exclave; namely Trecastle, in the township of Llywel eleven miles west of the main town. There is no evidence that any other boroughs in Breconshire actually took part in elections before 1597. The out boroughs then participating were Builth (now known as Builth Wells), Crickhowel or Crickhowell, Hay (now Hay-on-Wye) and Telgarth or Talgarth.

At some point between 1603 and 1715 the out boroughs ceased to participate in elections for the constituency. Until 1727 all the freemen of Brecon formed the electorate, but in 1727 the House of Commons ruled that only the resident freemen could vote. There had been about 180 electors in 1723 and 1727, but only 69 in 1744 after the basis of the franchise had been changed. There were about 100 voters between 1754 and 1790.

When registration of electors and an additional householder franchise were introduced in 1832, the constituency, still based on the town of Brecon, had the smallest electorate in Wales with just 242 registered voters.

Brecon was little affected by the upsurge of radical politics in the 1860s apart from the one occasion in 1866 when Thomas Price, the prominent nonconformist minister, intervened in a by-election contest to compel the Liberal candidate, the Earl of Brecknock, to issue an address more strongly in favour of reform.^[1]

Even after the extension of the franchise in 1868, the number of voters only increased to 814. This did, however, result in one of the most tumultuous elections in the history of the borough, which included a torchlight procession and lively meetings at which speakers struggled to make themselves heard.^[2] On election day it was generally accepted that supporters of the Conservative candidate, Howel Gwyn, had been caught engaged in bribery.^[3] His unseating by petition in April 1869 indicated how Brecon largely remained a closed borough, dominated by the politics of influence.

After 1885 Breconshire was represented in Parliament by the single member county constituency, which included all the boroughs formerly in the Brecon constituency.