Oceania
- American Samoa (unorganized, unincorporated territory of the United States)
- Governor -
- Tauese Sunia, Governor of American Samoa (1997–2003)
- Togiola Tulafono, Governor of American Samoa (2003–present)
- Governor -
- Australia
- Monarch - Elizabeth II, Queen of Australia (1952–present)
- Governor-General -
- Peter Hollingworth, Governor-General of Australia (2001–2003)
- Sir Guy Green, Administrator of the Commonwealth of Australia (2003)
- Michael Jeffery, Governor-General of Australia (2003–2008)
- Prime Minister - John Howard, Prime Minister of Australia (1996–2007)
- Christmas Island (external territory of Australia)
- Administrator -
- Bill Taylor, Administrator of Christmas Island (1999–2003)
- Ray Stone, Acting Administrator of Christmas Island (2003)
- Evan Williams, Administrator of Christmas Island (2003–2005)
- Shire President -
- Andrew Smolders, Shire president of Christmas Island (2001–2003)
- Gordon Thomson, Shire president of Christmas Island (2003–2011)
- Administrator -
- Cocos (Keeling) Islands (external territory of Australia)
- Administrator -
- Bill Taylor, Administrator of Cocos (Keeling) Islands (1999–2003)
- Ray Stone, Acting Administrator of Cocos (Keeling) Islands (2003)
- Evan Williams, Administrator of Cocos (Keeling) Islands (2003–2005)
- Shire President - Ronald Grant, Shire president of Cocos (Keeling) Islands (2001–2007)
- Administrator -
- Norfolk Island (self-governing territory of Australia)
- Administrator -
- Tony Messner, Administrator of Norfolk Island (1997–2003)
- Michael Stephens, Acting Administrator of Norfolk Island (2003)
- Grant Tambling, Administrator of Norfolk Island (2003–2007)
- Chief Minister - Geoffrey Robert Gardner, Chief Minister of Norfolk Island (2001–2006)
- Administrator -
- Fiji
- President - Ratu Josefa Iloilo, President of Fiji (2000–2009)
- Prime Minister - Laisenia Qarase, Prime Minister of Fiji (2001–2006)
- French Polynesia (French overseas territory until 28 March 2003, then French overseas collectivity)
- High Commissioner - Michel Mathieu, High Commissioner of the Republic in French Polynesia (2001–2005)
- President of the Government - Gaston Flosse, President of the Government of French Polynesia (1991–2004)
- Guam (Insular area of the United States)
- Governor -
- Carl T.C. Gutierrez, Governor of Guam (1995–2003)
- Felix Perez Camacho, Governor of Guam (2003–2011)
- Governor -
- Kiribati
- President -
- Teburoro Tito, President of Kiribati (1994–2003)
- Tion Otang, Chairman of the Council of State of Kiribati (2003)
- Anote Tong, President of Kiribati (2003–present)
- President -
- Marshall Islands
- President - Kessai Note, President of the Marshall Islands (2000–2008)
- Micronesia
- President -
- Leo Falcam, President of Micronesia (1999–2003)
- Joseph J. Urusemal, President of Micronesia (2003–2007)
- President -
- Nauru
- President -
- René Harris, President of Nauru (2001–2003)
- Bernard Dowiyogo, President of Nauru (2003)
- René Harris, President of Nauru (2003)
- Bernard Dowiyogo, President of Nauru (2003)
- Derog Gioura, President of Nauru (2003)
- Ludwig Scotty, President of Nauru (2003)
- René Harris, President of Nauru (2003–2004)
- President -
- New Caledonia (Sui Generis Collectivity of France)
- High Commissioner - Daniel Constantin, High Commissioner of New Caledonia (2002–2005)
- President of the Government - Pierre Frogier, President of the Government of New Caledonia (2001–2004)
- New Zealand
- Monarch - Elizabeth II, Queen of New Zealand (1952–present)
- Governor-General - Dame Silvia Cartwright, Governor-General of New Zealand (2001–2006)
- Prime Minister - Helen Clark, Prime Minister of New Zealand (1999–2008)
- Cook Islands (Associated state of New Zealand)
- Queen's Representative – Sir Frederick Tutu Goodwin, Queen's Representative of the Cook Islands (2001–present)
- Prime Minister - Robert Woonton, Prime Minister of the Cook Islands (2002–2004)
- Niue (associated state of New Zealand)
- Premier - Young Vivian, Premier of Niue (2002–2008)
- Tokelau (dependent territory of New Zealand)
- Administrator -
- Lindsay Watt, Administrator of Tokelau (1993–2003)
- Neil Walter, Administrator of Tokelau (2003–2006)
- Head of Government -
- Pio Tuia, Head of Government of Tokelau (2002–2003)
- Kolouei O'Brien, Head of Government of Tokelau (2003–2004)
- Administrator -
- Northern Mariana Islands (Commonwealth of the United States)
- Governor - Juan Babauta, Governor of the Northern Mariana Islands (2002–2006)
- Palau
- President - Tommy Remengesau, President of Palau (2001–2009)
- Papua New Guinea
- Monarch - Elizabeth II, Queen of Papua New Guinea (1975–present)
- Governor-General -
- Sir Silas Atopare, Governor-General of Papua New Guinea (1997–2003)
- Bill Skate, Acting Governor-General of Papua New Guinea (2003–2004)
- Prime Minister - Sir Michael Somare, Prime Minister of Papua New Guinea (2002–2011)
- Pitcairn Islands (British overseas territory)
- Governor - Richard Fell, Governor of the Pitcairn Islands (2001–2006)
- Commissioner - Leslie Jacques, Commissioner of the Pitcairn Islands (2003–present)
- Mayor - Steve Christian, Mayor of the Pitcairn Islands (1999–2004)
- Samoa
- Head of State - Malietoa Tanumafili II, O le Ao o le Malo of Samoa (1962–2007)
- Prime Minister - Tuilaepa Sailele Malielegaoi, Prime Minister of Samoa (1998–present)
- Solomon Islands -
- Monarch - Elizabeth II, Queen of the Solomon Islands (1978–present)
- Governor-General - Sir John Lapli, Governor-General of the Solomon Islands (1999–2004)
- Prime Minister - Sir Allan Kemakeza, Prime Minister of the Solomon Islands (2001–2006)
- Tonga
- Monarch - Tāufaʻāhau Tupou IV, King of Tonga (1965–2006)
- Prime Minister - Prince Lavaka Ata 'Ulukalala, Prime Minister of Tonga (2000–2006)
- Tuvalu
- Monarch - Elizabeth II, Queen of Tuvalu (1978–present)
- Governor-General -
- Sir Tomasi Puapua, Governor-General of Tuvalu (1998–2003)
- Faimalaga Luka, Governor-General of Tuvalu (2003–2005)
- Prime Minister - Saufatu Sopoanga, Prime Minister of Tuvalu (2002–2004)
- Vanuatu -
- President - John Bani, President of Vanuatu (1999–2004)
- Prime Minister - Edward Natapei, Prime Minister of Vanuatu (2001–2004)
- Wallis and Futuna (French overseas territory until 28 March 2003, then French overseas collectivity)
- Administrator-Superior - Christian Job, Administrator Superior of Wallis and Futuna (2002–2005)
- President of the Territorial Assembly - Patalione Kanimoa, President of the Territorial Assembly of Wallis and Futuna (2001–2005)
Read more about this topic: List Of State Leaders In 2003