Open Data Day (ODD) will take place from Saturday 1 to Friday 7 March. This annual global celebration highlights the importance of open data and its impact on communities worldwide. Local groups from almost every country will set up events throughout the week, showcasing how open data can be utilized within their communities. In 2025, ODD is focusing on the theme "Open Data to Tackle the Polycrisis," aiming to shed light on the interconnected issues of poverty, inequality, violence, and climate challenges.

Since 2023, ODD has embraced a more inclusive approach, allowing organizations to choose the best date for their events within a one-week window, promoting representation across different cultures and communities. All outputs from these events will be made available for anyone to use and re-use.

ODD is maintained and supported by the Open Knowledge Foundation (OKFN) through the Open Knowledge Network.