Gustaf Nils Algernon Adolf Stierneld (12 July 1791 – 14 November 1868) was a Swedish nobleman and non-political politician, serving twice as Prime Minister for Foreign Affairs during an important period in Swedish politics.

He was the only child of Adolf Ludvig Stierneld, one of the most famous document forgers in Swedish history.

Gustaf Algernon Stierneld was born to Adolf Ludvig Stierneld, one of the best and most prolific document forgers in Swedish history, and his wife Charlotte Gyldenstolpe, daughter of Nils Philip Gyldenstolpe.

He participated in the Conferences of Trachenberg and Frankfurt, as well as the Peace Congress of Kiel; the latter of which resulted in the Treaty of Kiel, where Frederick VI, King of Denmark ceded the Kingdom of Norway to Charles XIII, King of Sweden in return for Swedish Pomerania.

Due to political strife however, the office was de facto served by Albrecht Elof Ihre since 5 September 1840.