D. Domingos António de Sousa Coutinho, 1st Marquis of Funchal (20 February 1762 – 1 December 1833) was a Portuguese diplomat and author of several works on politics and diplomacy.

At first his family considered an ecclesiastical career for him, but he instead joined the diplomatic service, filling the posts of envoy in Denmark (1790-1795), Portuguese representative in Turin (1796-1803), ambassador in London (1803-1814) and in Rome (1814-1828).

[1] His period as ambassador to the Court of St James's coincided with the height of international conflict during the Napoleonic Wars.

He was intensely involved in secret diplomatic negotiations at this time as Portugal openly sided with Britain and refused to join the Continental System; Sousa Coutinho was of significant importance in arranging the details of the transfer of the Portuguese court to Brazil with British Foreign Secretary George Canning, thus guaranteeing British military protection to the Royal Family.

He was baptised on 27 February 1762; his godparents were the Count of Oeiras (who would later become more commonly known by the title of Marquis of Pombal) and Our Lady of the Immaculate Conception, both represented by proxy.