Mayor Boutaris will compete with 26 mayors around the world in the competition, which the World Mayors Foundation holds every two years.
Candidates claiming the title include the mayors of Calgary (Canada), Houston (USA), Bristol and Liverpool (Britain), Ghent (Belgium), Bordeaux (France), Seoul (South Korea), Izmir (Turkey) and Sydney (Australia).
The World Mayor Prize is awarded to a mayor who has made outstanding contributions to his and her community and has developed a vision for urban living and working that is relevant to towns and cities across the world.
Previous winners include the mayors of Bilbao (2012), Mexico (2010), Cape Town (2008), Melbourne (2006), Athens (Dora Bakoyannis, mayor of Athens in 2005) and Tirana (2004).
The 2014 World Mayor Prize will be given to the mayor that receives the most votes through a public voting on the website www.Worldmayor.com until mid-October.