2025 INTERNATIONAL ASTRONAUTICAL CONGRESS (IAC), Sept 29-Oct 3, 2025, Sydney, Australia

Update, September 26: A NASA press release lists NASA events that will be livestreamed or otherwise available on the International Astronautical Federation’s YouTube channel or social media outlets like Acting NASA Administrator Sean Duffy’s X account (@SecDuffyNASA) or NASA’s X account (@NASA).

The meeting is in Sydney, Australia, which is 14 hours ahead of Eastern Daylight Time.

Original Entry: The 2025 International Astronautical Congress (IAC) will take place from September 29-October 3, 2025 in Sydney, Australia.

The theme is “Sustainable Space: Resilience Earth.”

More information is on the event’s website.

The IAC comprises meetings of three organizations:

• International Astronautical Federation (IAF)
• International Academy of Astronautics (IAA)
• International Institute of Space Law (IISL), including the finals of the IISL Space Law Moot Court Competition

Pre-conference meetings of these groups are usually held the weekend before the conference.

The Space Generation Advisory Council (SGAC) usually holds its Space Generation Congress in conjunction with the IAC.