---
title: "K.S. Puttaswamy v. Union of India (2017) — Definition"
description: "K.S. Puttaswamy v. Union of India (2017) established the right to privacy as a fundamental right under Article 21, impacting legal interpretations in India."
url: "https://modeldiplomat.com/learn/glossary/k-s-puttaswamy-privacy-judgment-2017"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- K.
- S.
- Which earlier judgments did Puttaswamy overrule?
- What is the proportionality test laid down in Puttaswamy?
- Why did the case require a nine-judge bench?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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## Timeline

1. 24 August 2017

   On , in \*Justice K.S.

2. 26 September 2018

   The Aadhaar matter itself returned to a five-judge bench, which on upheld the constitutional validity of the Aadhaar Act, 2016 while striking down Section 5…

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In September 2018, the Supreme Court applied the Puttaswamy proportionality test in the Aadhaar judgment, upholding the Aadhaar Act, 2016 while striking down its Section 57.

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