The 2013 Garanti Koza WTA Tournament of Champions was a singles-only tennis tournament that was played on indoor hard courts. The tournament was sponsored by Turkish construction firm Garanti Koza. It was the fifth edition of the tournament and was part of the 2013 WTA Tour. The 2013 edition was the second to be held in Sofia at the Arena Armeec. The tournament was played between October 29 and November 3. Nadia Petrova was the defending champion, but she did not qualify this year, nor did she receive a wildcard into the event.

Arena Sofia is a multi-purpose indoor arena located in Sofia, Bulgaria. Opened in July 2011, it has a seating capacity of 12,373. It was formerly called Arena Armeets after the Bulgarian insurance company Armeets purchased the naming rights, until the sponsorship was terminated in October 2022.