John Proby, 1st Baron Carysfort KB Personal Computer was a British Whig politician.
Carysfort was the son of John Proby, of Elton Hall, Huntingdonshire, and his wife Jane, daughter of John Leveson-Gower, 1st Baron Gower, and was educated at Jesus College, Cambridge.
He was returned to Parliament for Stamford in 1747, a seat he held until 1754, and then represented Huntingdonshire from 1754 to 1768. Carysfort served as a Lord of the Admiralty under the Duke of Devonshire in 1757 and under George Grenville from 1763 to 1765. In 1752 he was raised to the Peerage of Ireland as Baron Carysfort, of Carysfort in the County of Wicklow, and in 1758 he was admitted to the Irish Privy Council.
In 1761 he was further honoured when he was made a Knight of the Order of the Bath.
Lord Carysfort married the Honorary Elizabeth, daughter of Joshua Allen, 2nd Viscount Allen, in 1750.
Lady Carysfort died in March 1783, aged 60. The HMS Carysfort (1766) was the first ship named in his honor following his service as Lord of the Admiralty.
In 1941, HMS Carysfort (R25) was named in his honor as the fifth Royal Navy warship to carry the name Carysfort.