World Hydrography Day
Marked on 21 June to raise awareness of hydrography, the survey and charting of seas and waterways that keeps shipping safe.
- UK
- USA
- Ireland (not marked)
- Canada (not marked)
- Australia (not marked)
- New Zealand (not marked)
- International
ListingAdded by us from official sources
Last checked19 October 2026
First heldNot known
About the day
World Hydrography Day is promoted by the International Hydrographic Organization, whose secretariat sets a theme each year. The 2026 theme is about transforming how ocean data is shared.
2026 theme
Transforming how ocean data is shared
The 2027 theme has not been announced yet.
Dates for the next three years
| Year | Date | Where | Status |
|---|---|---|---|
| 2027 | Monday 21 June 2027 | UK, USA, International | Same date every year |
| 2028 | Wednesday 21 June 2028 | UK, USA, International | Same date every year |
| 2029 | Thursday 21 June 2029 | UK, USA, International | Same date every year |
Where this information comes from
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