Anton Niklas Sundberg (27 May 1818, Uddevalla – 2 February 1900) was a Lutheran clergyman, and the Church of Sweden archbishop of Uppsala 1870–1900.He acquired a philosophy doctor's degree in Uppsala, became dean and was ordained a clergyman, and then undertook travel through Europe in 1849-50.
He was known as a controversial person; very outspoken, no stranger to using strong language and despising hypocrisy, but he displayed a remarkable sense of wit and authority.
At a dinner party he once exclaimed "Next to godliness and chastity, small schnapps glasses are the worst I know!" which became a somewhat familiar quotation in Sweden.
Sundberg was a member of the Swedish Academy from 1874 and of the Royal Swedish Academy of Sciences from 1877.