Arvid Mauritz Posse (5 January 1792 – 22 July 1850) was a Swedish politician, count and Marshal of the Realm, who served as Prime Minister for Justice in 1840 and between 1846 and 1848.

Prior to his appointment as Prime Minister for Justice, Posse had served as governor of Skaraborg County as well as director-general of the Swedish Customs Service.

By 1840, Posse became known for his liberal positions in matters concerning free trade in the Riksdag of the Estates and following the government resignation in 1840, the king had him appointed Prime Minister for Justice.

Following the political turmoil after the March Unrest and due to popular protests against the government, Posse resigned from his office in 1848 along with his most of his cabinet.

[3] In 1849, due to his declining health Posse resigned as Marshal of the Realm and died the following year in Gothenburg.