23 saved#4,200 of 6,224

International Open Data Day

An awareness observance on March 5 promoting awareness and use of open data through global events including talks, seminars, demonstrations, hackathons, and training.

Friday

March 2027

Last updated February 26, 2026 · by the Holiday Calendar Team

Have an update or spot an error?

YEARLY DATEMarch 5

OBSERVED INUnited States

CATEGORYTech

SUBCATEGORYSoftware

ORIGIN

Individual Initiative

FOUNDING ENTITY

David Eaves

FIRST OBSERVED

2010

HOW THE HOLIDAY CAME TO BE

David Eaves proposed International Open Data Day in a blog post on October 29, 2010, following discussions with collaborators to organize a global, decentralized open data hackathon. The first event took place on December 4, 2010, in multiple locations worldwide.

View Official Announcementvia eaves.ca

INTRO

Introduction

PHOTO

Get ready to celebrate the power of open data on March 5 for International Open Data Day! This global celebration was first launched in 2010 by a group of open government advocates, and has since grown into a worldwide event with hundreds of local gatherings focused on promoting the use and accessibility of open data. From governments to businesses to individuals, open data has the potential to create positive change and drive innovation in various industries. So join in on the festivities and learn more about the impact of this valuable resource!

TIMELINE

International Open Data Day Timeline

Open Government Directive in U.S.

The U.S. government issued an Open Government Directive ordering federal agencies to produce open data to promote transparency and innovation.

Creators Meet in Berlin

The creators of International Open Data Day met in Berlin, Germany, where they envisioned a worldwide event that promotes open data ideals.

First International Open Data Day

The first International Open Data Day was held on December 3, 2012, with online and offline events worldwide.

Open Data Charter Launched

The Open Data Charter was launched aiming to foster open, usable, and universally accessible data.

Shift to March 5th

International Open Data Day was permanently moved to March 5 to facilitate broader participation.

Open Data Day Goes Digital

Due to the COVID-19 pandemic, events marking International Open Data Day transitioned to online forums, showing the accessibility and versatility of open data.

GET INVOLVED

How to Celebrate International Open Data Day

Create an open data project

Use this day as an opportunity to start an open data project. It can be anything from creating a database to visualizing data in a new way. Get creative and see what insights you can uncover.

ATTEND

Attend a data hackathon

Join a local data hackathon or organize one yourself. This is a great way to collaborate with others and work on projects that benefit the community.

PARTICIPATE

Participate in an open data workshop

Attend a workshop to learn more about open data and how it can be used for social good. This is a great opportunity to expand your knowledge and meet others who are passionate about open data.

Share open data resources

Spread the word about open data by sharing resources and information on social media. Use #OpenDataDay to join the global conversation and raise awareness about the importance of open data.

COLLABORATE

Collaborate with local organizations

Reach out to local organizations and see how you can work together to promote open data in your community. This could include hosting a joint event or collaborating on a project that utilizes open data.

WHY THIS DAY MATTERS

Why We Love International Open Data Day

Increases efficiency in decision-making

By making data open and easily accessible, it can be used to inform decision-making processes in various sectors such as healthcare, education, and urban planning. This leads to more efficient and evidence-based decision making that benefits society as a whole.

Promotes transparency and accountability

Open data allows for better government accountability and transparency. By making data open and accessible, citizens are able to hold their governments accountable for their actions and policies.

Encourages innovation and collaboration

Open data provides a platform for individuals, businesses, and organizations to come together and collaborate on ideas and initiatives. It also encourages the creation of innovative solutions to societal problems using data-driven approaches.