Jaime Álvares Pereira de Melo
Duke of Cadaval
Equestrian Portrait of the Duke of Cadaval; Pierre-Antoine Quillard, c. 1728-1730.
Born	1 September 1684
Died	29 May 1749
Spouse	Luísa of Braganza Henriette Julienne de Lorraine
Issue	Nuno, Duke of Cadaval Joana Margarida, Marquise of Marialva Luísa, Countess of São Vicente
Religion	Roman Catholicism

D. Jaime Álvares Pereira de Melo (1 September 1684 — 29 May 1749), 3rd Duke of Cadaval, 5th Marquis of Ferreira, and 6th Count of Tentúgal, was a Portuguese nobleman and statesman.

Dom Jaime Álvares Pereira de Melo, 3rd Duke of Cadaval, was the third son of Dom Nuno Álvares Pereira de Melo, 1st Duke of Cadaval, 4th Marquess of Ferreira and 5th Count of Tentúgal, and his third wife Princess Marguerite of Lorraine-Armagnac.

The Duke was High-Equerry of the Royal Household of Pedro II of Portugal and subsequently that of João V of Portugal. In 1713, he became a Counselor of the State and War.

Jaime married twice, first to his dead brother's widow, Luísa of Braganza, natural daughter of King Peter II of Portugal, with whom he had no children, and then to Henriette Julienne Gabrielle de Lorraine, daughter of Louis de Lorraine, Prince of Lambesc, with whom he had four children, three surviving to adulthood:

• Nuno (1741-1771), 4th Duke of Cadaval, 6th Marquis of Ferreira, 7th Count of Tentúgal, who married D. Maria Leonor da Cunha e Távora, daughter of D. Miguel Carlos da Cunha Silveira e Távora, 5th Count of São Vicente.
• Joana, died in infancy.
• Margarida, married Diogo José Vito de Meneses Noronha Coutinho, 5th Marquis of Marialva, 7th Count of Cantanhede.
• Luísa, married Manuel Carlos da Cunha e Távora, 6th Count of São Vicente.