Maurice Mahon, 3rd Baron Hartland (6 October 1772 – 11 November 1845) was a Church of Ireland clergyman and Irish peer.
On 24 November 1813, he married Isabella Jane, the daughter of William Hume, but they had no children.
In 1814, he was appointed minor canon and vicar choral of St Patrick's Cathedral, Dublin.
[1] Maurice succeeded his eldest brother Thomas as Baron Hartland in 1835, but was declared a lunatic the following year.
The peerage became extinct, while the estate passed to his first cousin, Major Denis Mahon, who was assassinated by his tenants in 1847.