Peter Gladstone (16 October 1928 – 25 July 2000) was a British naturalist and wildfowl expert and patent attorney.
He grew up at Hawarden Castle in Wales, and attended Eton College, where his father, Charles Gladstone, was a housemaster.
He went on to teach biology at Shrewsbury School until 1971, when he joined Sir Peter Scott's Wildfowl and Wetlands Trust.
Gladstone developed the trust's wildfowl reserve at Martin Mere in Lancashire.
In the 1970s he took over the management of Fasque House, a family property in Aberdeenshire.