Foreign Service may refer to:

• Diplomatic service, the body of diplomats and foreign policy officers maintained by the government of a country
• United States Foreign Service, the diplomatic service of the United States government
  • Foreign Service Officer
  • Foreign Service Institute
  • Foreign Service Journal
  • Foreign Service brat, term for children born or raised abroad to Foreign Service Officers
• Indian Foreign Service, the diplomatic service of India
  • Foreign Service Institute of India now the Sushma Swaraj Institute of Foreign Service, under the Ministry of External Affairs in New Delhi, India
• Foreign Service of Pakistan, the diplomatic service of Pakistan
  • Foreign Service Academy
• Her Majesty's Diplomatic Service, the diplomatic service of the United Kingdom, and specifically the organisation which ran the Foreign Office in London before amalgamation with the Diplomatic Service in 1918