Henry Cary, 1st Viscount Falkland, KB, PC was an English landowner and politician who sat in the House of Commons from 1601 to 1622. He was created Viscount Falkland in the Scottish peerage in 1620. He was Lord Deputy of Ireland from 1622 until 1629.

Hertfordshire was a county constituency covering the county of Hertfordshire in England. It returned two Knights of the Shire to the House of Commons of England until 1707, then to the House of Commons of Great Britain until 1800, and to the House of Commons of the Parliament of the United Kingdom from 1801 until 1832. The Reform Act 1832 gave the county a third seat with effect from the 1832 general election.