Joseph Hardcastle

Joseph Hardcastle may refer to:

• Joseph Hardcastle (1752–1819), English merchant and a founder of The Missionary Society
• Joseph Hardcastle (politician), British Liberal Party MP
• Joseph Alfred Hardcastle, FRAS (1868–1917), grandson of Joseph Hardcastle (politician) and Sir John Herschel appointed Director of Armagh Observatory just before his death
• Joseph Hardcastle (accountant) (died 1906), American Certified Public Accountant

{{hndis|name=Hardcastle, Joseph}}