In Visual Studio 2015 how to reverse/undo a commit in Git?

Open the "Changes" tab in Team Explorer. Select "Actions", then "View History" to view the history of the repository. Identify the commit that you want to revert, right-click on it and select "Revert" from the context menu.

Selected answer is not correct. In order to undo a commit you need to select reset, not revert. Revvert will make a new commit with code contained in previous commit. Where reset will actually delete the commits after the selected version.