Álvaro de la Quadra (? – 1564) was a Spanish churchman and diplomat. He was Prelate and Ambassador to England during Elizabeth I of England reign. He was bishop of Aquila and Venosa and attended the Council of Trent. He was a descendant of Iñigo López de la Cuadra, who met Ferdinand the Catholic in 1476 on his visit to Vizcaya and captained his personal bodyguard, saving his life in an assassination attempt. His relatives also included Pedro de la Quadra (secretary to Isabella of Portugal) and Juan López de la Quadra (who taught Charles V's children Isabel and John).