Recent years have seen the widespread commercialization of devices and systems based on magnetorheological (MR) fluid technology, with automotive applications being the most prominent and promising. The primary suspension in passenger cars, the suspension of the driver’s seat in off-highway, construction, and agricultural equipment, and the steering-by-wire control of industrial, off-highway, and maritime vehicles are all examples of applications where MR fluid systems and devices have proved commercially successful. More than a hundred thousand MR dampers, shock absorbers, and brakes are in use on the roads today. Demand for MR devices is expected to grow by more than a million units each year, and that’s just for automotive platform applications. MR Fluid may be optimized for many uses, has high strength, and lasts a long time. MR Fluid has advanced to a high level of development, with rich experience-based guidelines backing up the fundamental material data and device design and models at its disposal. This article provides a concise overview of how MR Fluid Technology is currently being used and developed in the automotive and transportation industries.