Richard Merrill Mills Jr. (born February 23, 1959)[3] is an American diplomat serving as the United States ambassador to Nigeria since July 2024.

[6][5] In July 2014, Mills was nominated by President Barack Obama to be the United States Ambassador to Armenia, a position in which he served until October 2018.

[6] In November 2018, Mills assumed the position of Deputy Chief of Mission at the Embassy of the United States in Ottawa.

[10] On July 11, 2022, President Joe Biden announced his intent to nominate Mills to be the next United States ambassador to Nigeria.

[13] President Biden renominated Mills the same day and a hearing on his nomination was held before the Senate Foreign Relations Committee on March 1, 2023.