Olof Celsius the Younger (15 December 1716 – 15 February 1794) was a Swedish civil servant, church official, politician and historian.

His youthful tragedy Ingeborg was written during his years as a student (1737), and is notable as one of the first French classical dramas in Sweden.

[2] In 1738 he attempted to give Olof von Dalin's weekly journal Then Swänska Argus a successor, and published Thet swenska nitet [sv].

As a member of the Uppsala Society of Science, he also published many historical articles in his Tidningar om the lärdas arbeten [sv], self-published in 1742.

A major heroic poem, Gustaf Vasa (1774), was less successful, as were some hymns and translations of alexandrines from classical authors.

On 15 January 1788, Celsius became an honorary member of the Royal Swedish Academy of Letters, History and Antiquities.

Celsius also played a significant role in politics due to his eloquence, independence and personal reputation.

However, he disliked the excesses of the Caps' rule, and during the last two parliaments of the Age of Liberty he joined the united Royal Court and Hats parties.