Xanthan gum is a biopolymer heteropolysaccharide used in wide variety of foods / feed and other applications such as pharmaceuticals, cosmetic, petroleum production and other industries. Therefore, this study was aimed to produce highest amount of xanthan by Xanthomonas campestris grown on some industrial wastes and the results are summarized as follow: xanthan gum was maximized on the fourth day of fermentation with Garcia – Ochoa's medium supplemented with 3% sucrose + 5% corn steep liquor, which they stimulated the production of xanthan by tested organism. The addition of molasses such as sugar cane or beet as well as sugar cane juice and whey to the fermentation medium reduced greatly the production of xanthan, but the addition of whey plus whey hydrolyzed enzyme and sucrose to Garcia – Ochoa's medium enhanced the production of xanthan. Potato starchy waste reduced the production of xanthan with much more amount, but xanthan production was enhanced greatly with the addition of glucose syrup to the production media. Also, glucose syrup at 0.6% plus potato starchy waste (3%) gave over production of xanthan by Xanthomonas campestris. This means that, some available low price industrial wastes and raw materials may be used for highest production of an important product from microbes such as xanthan gum.