John Peachey, 2nd Baron Selsey, styled The Honourable John Peachey between 1794 and 1808, was a British politician.
Peachey was the son of James Peachey, 1st Baron Selsey, by Lady Georgiana Caroline Scott, daughter of Henry Scott, 1st Earl of Deloraine.
He was returned to Parliament for Street Germans in 1776, a seat he held until 1780, and then represented New Shoreham between 1780 and 1790. In 1808 he entered the House of Lords on the death of his father. Lord Selsey married Hester Elizabeth Jennings in 1784.
They had several children.
He died in June 1816, aged 67, and was succeeded by his eldest surviving son, Henry, a Captain in the Royal Navy. Lady Selsey died in April 1837.