Peter Martin Orla Lehmann (15 May 1810 – 13 September 1870) was a Danish statesman, a key figure in the development of Denmark's parliamentary government.

He was born in Copenhagen, son of Martin Christian Gottlieb Lehmann [da; no] (1775–1856), assessor, later conference councillor (konferensraad) and deputy in the College of Commerce.

Orla was put in the German realschule in the St. Petri parish, later moved to the Borgerdydskole and began his studies at the University of Copenhagen in 1827.

[1] During these years he was overshadowed by the younger National Liberals especially by Hall, however, he in many ways did great work behind the scenes, for instance, it was he who carried through the law of women's economic independence.

Being one of the most stirring speakers of early Danish parliamentarian life (almost like Lamartine in France), and besides a charming and committed man, Lehmann, however, seems to have lacked some sense of reality.