Christopher Thomas Landau (born November 13, 1963) is an American lawyer and diplomat who served as the United States Ambassador to Mexico from 2019 to 2021.

He earned his Bachelor of Arts in history, summa cum laude, from Harvard College in 1985, where he was elected to Phi Beta Kappa his junior year, earned a Certificate in Latin American Studies, and received the Sophia Freund Prize for the highest grade point average in his graduating class.

[7][8][9] He wrote his senior thesis, which was awarded the Hoopes Prize, on United States relations with the leftist government of Venezuela in the mid 1940s.

[5] After graduating from law school, Landau clerked for then-judge Clarence Thomas of the United States Court of Appeals for the District of Columbia Circuit.

He was chairman of the firm's appellate practice until he left after 25 years to join Quinn Emanuel Urquhart & Sullivan in 2018.

[22] On September 9, 2020, President Trump added Landau to a list of potential nominees to the Supreme Court of the United States.

By July 2020, Landau's follower count had exploded to 245,000, in what Slate described as providing "an unexpected lesson in American digital diplomacy.

Landau replied by sarcastically saying "Obviously, your great education and knowledge of the world would allow you to do diplomatic work much better than the ‘rudimentary’ communications of this ‘white foreigner.'