Sir John Lambert, 1st Baronet (1666 – 4 February 1723) of London, was a French-born English merchant.

He was the eldest son of Jean Lambert (d. 1702), a merchant of Saint-Martin-de-Ré, Île de Ré, France, by Marie Le Fevre.

[2] On the recommendation of Robert Harley, Chancellor of the Exchequer, he was created a baronet on 16 February 1711.

He married, in or before 1690, Madeleine, daughter of Benjamin Bruzelin, who was a merchant in Rouen.

[2] The first baronet died on 4 February 1723, and he was succeeded by his eldest son, John.