The Foreign Agricultural Service (FAS) is the foreign affairs agency with primary responsibility for the United States Department of Agriculture's (USDA) overseas programs – market development, international trade agreements and negotiations, and the collection of statistics and market information. It also administers the USDA's export credit guarantee and food aid programs and helps increase income and food availability in developing nations by mobilizing expertise for agriculturally led economic growth. The FAS mission statement reads, "Linking U.S. agriculture to the world to enhance export opportunities and global food security," and its motto is "Linking U.S. Agriculture to the World."

The United States Foreign Service is the primary personnel system used by the diplomatic service of the United States federal government, under the aegis of the United States Department of State. It consists of over 13,000 professionals carrying out the foreign policy of the United States and aiding U.S. citizens abroad. Its current director general is Marcia Bernicat.