On the main homepage (not your userpage) there is a bar at the top with four buttons:

News Feed    Pull Requests    Issues    Stars

Click Pull Requests.

This home page can be accessed by clicking the octocat logo in the top-left, whereas your userpage is accessed by clicking your username in the top-right.

It should look like this:

I had the same question this morning and would have found hyperlinks easier than the accepted answer (which led me to write my own)!

• All my pull requests: These aren't (currently) shown on one page. But...
• My open pull requests: https://github.com/dashboard/pulls (open PRs are shown by default)
• My closed pull requests: https://github.com/dashboard/pulls?state=closed

October 2014

GitHub have launched new dashboards.

Example New URLs

• All my pull requests: https://github.com/pulls?q=is:pr+author:johnsyweb
• My open pull requests: https://github.com/pulls (your open PRs are still shown by default)
• My closed pull requests: https://github.com/pulls?q=is:pr+is:closed+author:johnsyweb

Note: Use your GitHub username rather than mine, which I've left in merely as an example.

i used the pulse option in the right side panel https://github.com/{your username}/{your repo}/pulse

Visit github.com/pulls to see all your PRs.

To view the pull requests that your team is working on, you can use the Github "team" query like team:myOrg/myTeamName. Or you can use MyTeamsPRs which lets you do the same but with an easier-to-use UI.

(Just to add some snapshot snippets for visual benefits here, in addition to the already very well-documented responses previously / above)

GitHub Main Page

On GitHub Main Page, there is a box on the right called "Repositories you contribute to" - I believe these are the repositories where user raised a pull-request and got merged.

GitHub Pull Page

... and more on GitHub Pull Page:

Open:

Closed: