Count Mikhail Illarionovich Vorontsov (Михаи́л Илларио́нович Воронцо́в) (1714 - 1767) was a Russian statesman and diplomat.

At the age of fourteen, Vorontsov was appointed a kammerjunker at the court of the tsesarevna Yelizaveta Petrovna, whom he materially assisted during the famous coup d'etat of December 6, 1741, when she mounted the Russian throne on the shoulders of the Preobrazhensky Grenadiers . On January 3, 1742, Vorontsov married Anna Skavronskaya , the empress's cousin, and in 1744 was created a count and vice-chancellor. His jealousy of Aleksei Petrovich Bestuzhev-Ryumin induced him to participate in Lestocq 's conspiracy against that statesman. The empress's affection for him (she owed much to his skilful pen and still more to the liberality of his rich kinsfolk) saved him from the fate of his accomplices, but he lived in a state of semi-eclipse during the domination of Bestuzhev. On the disgrace of Bestuzhev, Vorontsov was made imperial chancellor in his stead. Though well-meaning and perfectly honest, Vorontsov as a politician was singularly timorous and irresolute, and always took his cue from the court. Thus, under Yelizaveta Petrovna he was an avowed enemy of Prussia and a warm friend of Austria and France; yet he made no effort to prevent Peter III from reversing the policy of his predecessor. Yet, he did not lack personal courage, and endured torture after the revolution of July 9, 1762, rather than betray his late master. He greatly disliked Catherine II, and at first refused to serve under her, though she reinstated him in the dignity of chancellor. When he found that the real control of foreign affairs was in the hands of Nikita Panin, he resigned his office in 1763.