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) appointed Director of Armagh Observatory just before his death.
- Joseph Hardcastle, first Certificate in Public Accountancy achieved through examination and experience.