Paulo Henrique Lowndes Marques (21 August 1941-1 January 2011) was a Portuguese politician, lawyer, author, historian and conservationist.

In his youth he would have been exposed to many English writers who passed through Lisbon and visited his parents, including Graham Greene, Evelyn Waugh, Cyril Connolly, Rose Macaulay, Aldous Huxley, Angus Wilson and Sachaverell Sitwell.

This was part of a programme designed to augment naval forces through short-term appointments at a time when Portugal was struggling to keep its colonies.

In 1974, after the collapse of the right-wing Estado Novo government in what became known as the Carnation Revolution, he became one of the founder members of the Christian Democratic CDS – People's Party.

[2] Lowndes Marques was also President of the Portuguese-British Chamber of Commerce; Honorary Legal Adviser to the British Ambassador; Chairman of the British Historical Society of Portugal for 25 years;[12] Honorary Vice-president of the Anglo-Portuguese Society; and President of the World Monuments Fund Portuguese branch.

He was also legal advisor to and Chairman of the Annual General Meeting of St. Julian's School (which named its library after him),[2] the Association of Friends of Monserrate Palace at Sintra, and of an organization that funded maternity wards in the former Portuguese colony of East Timor.

He was also Secretary-General of the Cabinda Gulf Oil Company Ltd.[1] As a lawyer he was a member of the Portuguese, British and International Bar Associations.