Catherine Herbert, Countess of Pembroke and Montgomery (born Yekaterina Semyonovna Vorontsova; Russian: Екатерина Семёновна Воронцова; 24 October 1783 – 27 March 1856), was a Russian noblewoman who married the 11th Earl of Pembroke.

She was born in Saint Petersburg, the daughter of Ekaterina Alekseevna Seniavina and Count Semyon Vorontsov (sometimes spelt Woronzow), the Russian Ambassador in Britain from 1785 to 1806.

She was the only sister of Prince Mikhail Vorontsov, Viceroy of New Russia and Caucasus.

[1] She was a niece of Imperial Chancellor Alexander Vorontsov, Elizaveta Vorontsova and Princess Dashkova, a friend of Catherine the Great and a conspirator in the coup d'état that deposed Tsar Peter III and put his wife on the throne.

Upon her husband's death, the earldoms were inherited by his son from his first marriage, Robert Herbert.