Yes! Cold brew coffee is slightly less acidic than hot brewed coffee. According to a study conducted by researchers at Thomas Jefferson University, "Cold brew coffees across all three roast temperatures were slightly less acidic than their hot brew counterparts." However, the study also found that the roast temperature (light, medium, dark) of the beans themselves may have a larger effect on the acidity of the coffee than the brewing method does. A darker roast coffee bean means a lower acidity coffee.