de Horsey is a British surname and may refer to:
People Algernon Frederick Rous de Horsey (1827–1922), Knight and Royal Navy Admiral Spencer Horsey de Horsey (1790–1860), Conservative Party politician in the UK Spencer Horsey de Horsey (1790 – 20 May 1860), known until 1832 as Spencer Horsey Kilderbee, was a British Tory politician. ... William Henry Beaumont de Horsey (died 1915), British soldier, son of Spencer Horsey de Horsey and brother of Algernon Frederick Rous de Horsey and Adeline Louisa Marie de Horsey Adeline, Countess of Cardigan and Lancastre, born Adeline Louisa Marie de Horsey
Places De Horsey Island, British Columbia, named for Admiral de Horsey De Horsey Passage, British Columbia, named for Admiral de Horsey