Francisco Lopes Suasso, second Baron d'Avernas le Gras (c. 1657 – 22 April 1710) was a banker and financier of the Dutch Republic.

The Lopes Suassos were a wealthy old Sephardic family of Marranos, or Jews who had been forced to convert to Christianity under pressure from the Portuguese Inquisition, but once in Amsterdam they openly returned to their true religion, Judaism.

She was the daughter of the banker Manuel (otherwise Isaac) Teixeira, who after Suasso's father and De Pinto was the third most important Portuguese-Jewish merchant-banker in Northern Europe, by his marriage to Beatrix Nunes Henriques.

[2] In an age of strategic marriages, the union can be seen as intended to raise capital within a narrow circle, but this design was thwarted when Judith died childless in 1689.

[1] Suasso was responsible for a number of elements of the invasion, and through his father-in-law in Hamburg he was able to make speedy arrangements for the transport of Swedish and Pomeranian troops provided in November 1688 by Charles XI of Sweden to assist William.

Following the death of his first wife in 1689, on 23 February 1694 Suasso married secondly, at The Hague, Leonora (otherwise Rachel) da Costa (1669–1749), and with her had ten children, who became part of a large family network.