D. Pedro Mascarenhas, 1st Count of Sandomil (9 November 1670 – 3 August 1745), was a Portuguese nobleman and colonial administrator, Viceroy of India from 1732 to 1741.

[1] He fought at the War of the Spanish Succession at the rank of Mestre de campo general.

[1] The Count of Sandomil was nominated Viceroy of India on 12 March 1732, sailing from Lisbon to Goa on 26 April, and he was sworn on 7 November.

[1][2] His government was effectively disastrous, because in 1739 he lost the Província do Norte (Northern Province), and in 1740 a Portuguese squadron was destroyed and captured by the Marathas.

[1] On 18 May 1741 he handed over the government to the Marquis of Louriçal and on 6 January 1742 he returned to Portugal, arriving in Lisbon in November of the same year.