Complete Half-Life 3 Timeline
2006 - 2026

By OPGman
Published on May 8, 2026
Last updated on June 23, 2026

This is a complete 20 year timeline of every single piece of news or noteworthy information (credible or not) related to Half-Life 2: Episode 3 or Half-Life 3. This is more than likely incomplete to some extent, so feel free to create an issue or PR on GitHub to get something on the timeline added or changed.

This is an independent project that has no affiliation with Valve. Each item on the timeline links to the source that was used to find that information. I tried to use the original sources whenever possible, but in many cases I had to choose the next best thing due to broken links or missing info. You are free to use this timeline for your own purposes as long as you give appropriate credit and provide a link to this page.

If you're looking for a timeline of strictly factual events that focuses on the development of the Half-Life series post-Episode 2, check out the Combine OverWiki. The design of this page was partially inspired by time-life3.com. If you want info specifically on HLX, you should check them out.