AbstractSingle‐stage continuous fermentations to produce xanthan gum have been run at dilution rates (D) from 0.023 to 0.196 hr−1. Xanthan production rate (XPR) was a function ofD. XPR increased from 0.34 g/hr/kg atD= 0.023 hr−1to the maximum 0.84 g/hr/kg atD= ca. 0.15 hr−1. AtD>0.15 hr−1XPR decreased and at the highestDstudied (0.196 hr−1) was 0.69 g/hr/kg. Yield of xanthan from glucose consumed was 81–89%. Steady states ended between 6.5 and 8.7 turnovers when a variant st