Indo-Pasifik Empat (Bahasa Inggris: Indo-Pacific Four) adalah empat negara mitra Organisasi Pakta Pertahanan Atlantik Utara yang berada di wilayah Indo-Pasifik yakni Jepang, Korea Selatan, Selandia Baru dan Australia. Keempat negara ini terletak di wilayah Samudra Pasifik bagian barat: Jepang dan Korea Selatan di Asia Timur, sementara Australia dan Selandia Baru di Australasia.^{[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]}

Di tengah lanskap keamanan regional yang lebih bergejolak, para ahli baru-baru ini berpendapat bahwa diperlukan kerja sama yang lebih kuat antara IP4 dan Eropa serta AS, dengan tujuan untuk membina kawasan Indo-Pasifik yang lebih stabil.^[16]

1. ^ "US wants to 'institutionalize' grouping of NATO's four Indo-Pacific partners: Campbell". 11 July 2024.
2. ^ "4 Asia-Pacific nations, NATO eye cooperation against disinformation". Mainichi Daily News. 6 July 2024.
3. ^ "NATO to up security links with Japan, South Korea, Australia, NZ".
4. ^ "PM chairs Indo-Pacific Four meeting". 12 July 2024.
5. ^ "NATO and Indo-Pacific Partners: Understanding Views and Interests". Diarsipkan dari asli tanggal June 8, 2023.
6. ^ "NATO and its Indo-Pacific Partners Choose Practice over Rhetoric in 2023".
7. ^ "How to institutionalize NATO's cooperation with its closest Pacific partners".
8. ^ "What's Behind NATO's Tightening Ties with its Indo-Pacific Partners?". Diarsipkan dari asli tanggal July 16, 2023.
9. ^ "Paris plays spoiler on NATO's deepening Indo-Pacific ambitions".
10. ^ "Japan and NATO usher in new era of cooperation amid China concerns". 12 July 2023.
11. ^ "(Yonhap Interview) Emerging IP4 underscores deeper security alignment beyond region: NZ deputy PM".
12. ^ "Nato's gang of four in the Indo Pacific".
13. ^ "Informal Talks among Japan-Australia-New Zealand-ROK (IP4) Leaders and the president of the United States (Summary)".
14. ^ "Japan, S.Korea, Australia, New Zealand pledge continued support to Ukraine | NHK WORLD-JAPAN News".
15. ^ "To counter China, NATO and its Asian partners are moving closer under US leadership". 9 July 2024.
16. ^ Abbondanza, G. (March 2025). "NATO-Europe-US Cooperation in the Indo-Pacific: Challenging Times Ahead". IAI Commentaries. 25 (15): 1–6.