The Marquess of Lansdowne is a title in the British peerage, created in 1784. The title is associated with the Lansdowne family, particularly known for their contributions to British politics and society. The first Marquess, Henry Petty-Fitzmaurice, was a prominent statesman and served as Prime Minister in the 19th century. The Lansdowne estate, located in Wiltshire, includes the historic Lansdowne House in London, which is notable for its architecture and art collection. The title has been held by several notable figures, each contributing to the family's legacy in various fields, including politics, arts, and philanthropy.