---
title: "Hans Morgenthau: Classical Realism Pioneer | Model Diplomat"
description: "Hans Morgenthau was a key figure in international relations, known for his 1948 work that established classical realism, influencing diplomats and scholars."
url: "https://modeldiplomat.com/learn/glossary/hans-morgenthau"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Hans Morgenthau was a German-American scholar whose 1948 work Politics Among Nations founded modern classical realism in international relations theory.
- What are Morgenthau's Six Principles of Political Realism?
- How does classical realism differ from Waltz's neorealism?
- Why is Morgenthau's opposition to the Vietnam War significant?
- Who were Morgenthau's intellectual predecessors and rivals?

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In 1965, Hans Morgenthau publicly debated McGeorge Bundy and opposed escalation in Vietnam, arguing the intervention failed any rational test of the American national interest.

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