"The International Organisation of Vine and Wine (OIV, from its French language name L'Organisation Internationale de la Vigne et du Vin) is an intergovernmental organization which deals with technical and scientific aspects of viticulture and winemaking. The field of OIV includes grape production for all purposes, i.e. not just wine, but also table grapes and raisin production.
One of the activities of OIV is the compilation of global statistics within its field.
OIV is based in Paris, and had 44 member states as of 2013.
The earliest forerunners of the OIV are the international conferences held as a reaction to the 19th century phylloxera epidemic, with the five-nation Montpellier Congress held October 26 to October 30, 1874 being the foremost among these. The idea of an international organization came up several times during the coming decades, and finally, on November 29, 1924, eight nations signed an agreement concerned with the creation of an International Wine Office (Office international du vin, OIV) in Paris. After that the agreement went back to nations for ratification. The first working session was held at Salon de l’Horloge on December 3, 1927. On September 4, 1958, the organization's name was changed to the International Vine and Wine Office (Office International de la Vigne et du Vin).
The current International Organisation of Vine and Wine was established following an 35-nation agreement on April 3, 2001, and replaced the International Vine and Wine Office. This agreement went into effect on January 1, 2004. More on the history of OIV can be found here.
Member States are:
Algeria, Argentina, Australia, Austria, Armenia, Belgium, Bosnia-Herzegovina, Brazil, Bulgaria, Chile, Croatia, Cyprus, Czech Republic, Finland, France, Georgia, Germany,Greece, Hungary, India, Israel, Italy, Lebanon, Luxemburg, Macedonia, Malta, Moldavia, Montenegro, Morocco, Netherlands, New Zealand, Norway, Peru, Portugal, Romania, Russia,Serbia, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Turkey, Uruguay.
By googling this organization I noticed that OIV actually uses two flags together simoultaneously, The other one is also white, but it depicts the logo only, without its name next to it.