The Retired Players screen (League Menu >> History section >> Recently Retired Players >> Retired Players tab) lists all players who have retired from the currently selected league:

On this page, you can take advantage of OOTP's Views, Filters, and many of the Common Drop-Downs. Review those sections to get a better understanding of how to manipulate the data on this screen to suit your needs.

Commissioners also have the ability to unretire players.