---
title: "Quadrilateral Security Dialogue Definition | Model Diplomat"
description: "The Quadrilateral Security Dialogue (Quad) is a strategic forum of the US, India, Japan, and Australia for a free and open Indo-Pacific."
url: "https://modeldiplomat.com/learn/glossary/quadrilateral-security-dialogue"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The Quadrilateral Security Dialogue (Quad) is a strategic forum of the United States, India, Japan, and Australia coordinating on a free and open Indo-Pacific.
- Is the Quad a military alliance?
- When was the Quad founded and revived?
- What is the relationship between the Quad and the Malabar exercise?
- How does the Quad differ from AUKUS?

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In September 2021, US President Joe Biden hosted Narendra Modi, Yoshihide Suga, and Scott Morrison at the first in-person Quad summit in Washington, launching working groups on vaccines, critical technology, and climate.

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