It would be uneasy to pick just one person as the best violinist in the world as there is no criteria to rate them. Also we have had great violinists in the best and we have those that are doing well in today’s era.
Though, they are a lot of good violinists, some of them have been recognized and known to be exceptional from time past to this present era. Example of such great violinist include: Sara Chang, Nicola Benedetti, Eugene Ysaye, Antonio Vivaldi, Maxim Vengerov, Isaac Stern, Pablo de Sarasate, Niccolo Paganini, Fritz Kreisler, Itzhak Perlman and a host of others.