Grover Joseph Rees III (born October 11, 1951) is a Louisiana lawyer who served as chief justice of the High Court of American Samoa from 1986 to 1991, and as the first United States Ambassador to East Timor from 2002 to 2006.

[4] In 2002, President George W. Bush nominated Rees as the first United States Ambassador to East Timor.

[4] Rees presented his credentials to the president of the Democratic Republic of East Timor, Kay Rala Xanana Gusmão in December 2002, and thereafter served for four years.

[8] In 2017, Rees was one of a group of 25 international figures who released a joint statement describing the 2017 imprisonment of Hong Kong democracy activists as "outrageously unjust".

The signatories called the Umbrella Movement "one of the most peaceful and restrained movements of public protest the world has ever seen" and wrote that the sentencing amounted to "an outrageous miscarriage of justice, a death knell for Hong Kong’s rule of law and basic human rights, and a severe blow to the principles of 'One Country, Two Systems'".