Somewhere right now, a journalist is using government spending data to uncover corruption. A scientist is sharing climate research datasets so that colleagues on another continent can build on their findings. A community group is mapping local air quality to hold polluters accountable. None of this would be possible without open data — information that anyone can access, use, and share freely. Open Data Day, observed on 7 March 2026, brings together thousands of people in cities around the world to celebrate, promote, and advance the open data movement.
What is Open Data Day?
Open Data Day is an annual international event that encourages governments, businesses, and civil society to adopt and promote open data policies. The day features hackathons, workshops, meetups, and discussions in hundreds of cities worldwide. Open data refers to data that is made publicly available without restrictions on use, modification, or sharing — typically published in machine-readable formats under open licences. The event is coordinated by the Open Knowledge Foundation and supported by a global network of volunteers and organisations.
When is Open Data Day?
Open Data Day 2026 falls on Saturday, 7 March 2026. The event is traditionally held on the first Saturday of March each year, though some local events may extend activities across the surrounding week.
| Year | Date |
|---|---|
| 2026 | Saturday, 7 March |
| 2027 | Saturday, 6 March |
| 2028 | Saturday, 4 March |
| 2029 | Saturday, 3 March |
| 2030 | Saturday, 2 March |
Why Open Data Day Matters
Open data is a cornerstone of transparent governance, scientific progress, and civic participation. When governments publish spending data, contract details, and legislative records in accessible formats, citizens can hold institutions accountable. The World Bank estimates that open data could unlock $3 to $5 trillion in annual economic value globally through improved efficiency, innovation, and consumer decision-making. Open Data Day provides a focal point for demonstrating this value and for encouraging institutions that have not yet embraced openness to start.
How to Get Involved in Open Data Day
Whether you are a data scientist, a student, a journalist, or simply a curious citizen, there are meaningful ways to participate.
- Attend a local Open Data Day event — Check the official Open Data Day website for events in your city. Activities range from beginner-friendly workshops to advanced hackathons where teams build tools and visualisations using public datasets.
- Organise your own event — If no event exists in your area, the Open Knowledge Foundation provides toolkits and guides for hosting your own meetup, workshop, or hackathon. Events can be as simple as a café discussion or as ambitious as a full-day coding sprint.
- Explore open data portals — Spend time browsing government open data portals such as data.gov (US), data.gov.uk (UK), or the European Data Portal. Search for datasets relevant to your community — local transport, air quality, crime statistics, public health — and think about how they could be used to inform decisions.
- Build something with open data — Use free tools like Python, R, or even Excel to analyse a public dataset and create a visualisation, a map, or a simple application. Share your work online to inspire others.
- Advocate for open data policies — Write to your local representatives urging them to publish government data in open, machine-readable formats. Many governments still hold vast quantities of publicly funded data behind closed doors.
- Learn about open data through online courses — Platforms like the Open Data Institute, Coursera, and edX offer free courses on open data principles, data literacy, and data journalism. Use Open Data Day as your starting date.
- Share the message on social media — Post about open data projects, success stories, or datasets you find interesting using #OpenDataDay and #ODD2026. Raising awareness beyond the data community is one of the day’s key goals.
History of Open Data Day
Open Data Day was founded in 2010 by David Eaves, a Canadian public policy entrepreneur and open government advocate. The first event was a relatively small gathering of open data enthusiasts in a handful of cities. The concept resonated quickly, and within a few years, hundreds of events were taking place simultaneously across dozens of countries.
The Open Knowledge Foundation took on the coordination role, providing a central platform for event registration, mini-grants for local organisers, and promotional resources. By 2020, Open Data Day events were being held in over 300 cities worldwide, spanning every continent. The day has been supported over the years by organisations including the World Bank, Microsoft, Hivos, and various national governments.
Open Data Day sits within a broader open data movement that gained significant momentum in the late 2000s. Barack Obama’s 2009 Open Government Directive in the US, the launch of data.gov, and the UK’s open data initiative under Sir Tim Berners-Lee all helped establish open data as a mainstream policy priority. The movement draws on earlier traditions of scientific openness, freedom of information legislation, and the open-source software community. If you are interested in the intersection of technology and civic engagement, British Science Week, running from 6 to 15 March 2026, explores many similar themes around public understanding of science and technology.
Noteworthy Facts About Open Data
- The World Bank estimates that open data could generate $3 to $5 trillion in annual economic value across seven key sectors including healthcare, education, and transportation.
- Open Data Day 2020 featured events in over 300 cities across six continents, making it one of the largest decentralised civic technology events in the world.
- The UK Government’s open data portal, data.gov.uk, hosts over 50,000 datasets covering everything from school inspection results to flood risk maps.
- Open data has been credited with saving lives during the COVID-19 pandemic by enabling researchers to share case data, genomic sequences, and vaccine trial results in real time.
- The Open Data Barometer, published by the World Wide Web Foundation, ranks countries on their open data readiness, implementation, and impact — the UK, Canada, and France have consistently topped the rankings.
Frequently Asked Questions
What is Open Data Day?
Open Data Day is an annual international event held on the first Saturday of March, promoting the use and availability of open data through hackathons, workshops, and community events worldwide.
When is Open Data Day in 2026?
Saturday, 7 March 2026.
What is open data?
Open data is information that is freely available for anyone to access, use, modify, and share. It is typically published in machine-readable formats under open licences, enabling transparency, innovation, and civic participation.
Spread the Word
Help raise awareness by sharing Open Data Day with your friends, family, and followers. Use the hashtags #OpenDataDay and #ODD2026 on social media. The more people who understand the value of open data, the stronger the demand for transparent, accessible public information becomes.
Related Awareness Days
- British Science Week — Running 6-15 March 2026, celebrating science, technology, engineering, and mathematics.
- World Meteorological Day — Observed on 23 March, highlighting how open weather data supports communities worldwide.
- Copyright Law Day — Celebrated on 1 January, exploring the intersection of intellectual property and information access.
Links
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