Sir Henry Cairnes, 2nd Baronet (1673 – 16 June 1743) was an Irish politician, banker and baronet.

He was the third and youngest son of John Cairnes

John Cairnes (politician)

John Cairnes was an Irish politician.He was the son of Thomas Cairnes and his wife Jane Scott, daughter of John Scott. In 1639, Cairnes was elected as Member of Parliament for Augher, representing the constituency in the Irish House of Commons until the following year.He married Jane Miller,...

 and his wife Jane Miller, daughter of James Miller. In 1733, according to a special remainder he succeeded his oldest brother Alexander as baronet. Another brother was William Cairnes

William Cairnes

William Cairnes was an Irish politician and merchant.He was the second son of John Cairnes and his wife Jane Miller, daughter of James Miller. His brothers were Alexander Cairnes and Henry Cairnes...

. In 1733, Cairnes entered the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Monaghan Borough

Monaghan Borough (Parliament of Ireland constituency)

Monaghan Borough was a constituency represented in the Irish House of Commons until 1800. Between 1725 and 1793 Catholics and those married to Catholics could not vote.-1692–1801:...

, the same constituency Alexander had represented before, and sat for it until his death in 1743.

On 10 July 1711, he married Frances Gould, daughter of John Gould, his brother's brother-in-law, at St Peter le Poer

St Peter Le Poer

St Peter le Poer was a church on the west side of Broad Street in the City of London. The church, often spelt "St Peter le Poor" was in existence by the end of the twelfth century...

in London. He died childless and with his death the baronetcy became extinct.