Arthur Boggess Culvahouse Jr. (born July 4, 1948) is an American attorney who served as the United States Ambassador to Australia from 2019 to 2021. He is the former Chair of O'Melveny & Myers, an international law firm of more than 1,000 lawyers with offices around the world. Culvahouse also served as counsel to Ronald Reagan in the last two years of his presidency, and was entrusted by John McCain and Donald Trump to vet their vice presidential candidates.