Official

World Metrology Day 2026

World Metrology Day falls on May 20, 2026.

20 May 2026
Date May 20, 2026 Wednesday 26 days ago Source: UNESCO

About this observance

An official international observance listed by UNESCO and marked on May 20.

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Frequently Asked Questions

World Metrology Day is listed for May 20, 2026 in 2026.

The current source label for this entry is UNESCO.