This document lists the evolution of Google's logo design over time from 1998 to 2015. It includes 7 different logo designs used by Google from their original logo in 1998 through revisions in August 1998, September 1998, May 1999, May 2010, September 2013, and September 2015. The document provides images of each logo design change and directs to a link for more information on Google's logo history.