Where can I see all the comments I wrote on issues on the GitHub website?
https://github.com/issues only list the issues I have opened, and not the issues I have commented on.
Where can I see all the comments I wrote on issues on the GitHub website?
https://github.com/issues only list the issues I have opened, and not the issues I have commented on.
Using the search box at the top of GitHub web pages, you can perform a variety of searches. 
To view issues you've commented on use the following search string:
Sample Search URL
is:issue commenter:@me To show only open issues, add the is:open qualifier:
Sample Search URL
is:issue commenter:@me is:open The search can also be adapted for any user by replacing @me with their GitHub username. Do not include the @ symbol in this case.
For example, for the username defunkt/@defunkt use:
Sample Search URL
is:issue commenter:defunkt You can filter your subscribed notifications for only those where you commented on a thread, by selecting Comment as the Reason at github.com/notifications/subscriptions or by appending ?reason=comment to the URL (github.com/notifications/subscriptions?reason=comment).
While you can only filter for a single Reason at a time, other available options include Assign, Author, Manual, Mention, Review Requested, State Change, Team Mention
You can use the Repository dropdown with or without Reason to filter notifications by a specific repository.
Easier and improve from the accepted answer:
is:issue commenter:@me
View all my comments on GitHub Issues
Visit: https://github.com/issues?q=is%3Aissue+commenter%3A%40me+sort%3Aupdated-desc
Explained
is:issue commenter:@me sort:updated-desc commenter:@me dynamically always filters by the logged in user (you could also replace @me with your actual username)sort:updated-desc the default sort is based on Newest which looks at issue creation date. Setting to sort by updated means issues with the most recent posts will appear first (this is what I expected the default to be)Alternatively, https://github.com/notifications/subscriptions works as a decent proxy, but if you have unsubscribed to an issue it won't show here any more (thanks @guettli for this one).
You can also use involves:<username> in the search bar of issues which consists of more issues than commenter:<username>
For instance, if you only create a new issue without any comments, the involves prefix considers it, but not commenter.
If you want to search for multiple users in a single search, use it like in the global search bar without the OR logical conjugation:
commenter:FantomX1 commenter:FantomX1-github
since the similar google way approach with 'OR' would not work
commenter:FantomX1 OR commenter:FantomX1-github