Abstract Drilling with casing has proven to be an effective method of reducing drilling costs and solving drilling problems. Most of the current Casing Drilling* activity is focused on drilling vertical wells, but interest in directional wells is increasing as the benefits of Casing Drilling in straight holes are demonstrated. A directional Casing Drilling system has been run sufficiently to prove that directional drilling with casing can be practical with casing sizes from 5-1/2" to 13-3/8". The system uses a wireline retrievable directional drilling assembly, positioned in the lower end of the casing, to replace the conventional directional tools used when drilling with drill pipe. These tools have been used to drill to inclinations greater than 90° and have been retrieved and re-run at inclinations ranging from vertical to horizontal. The directional Casing Drilling system can be used for a broad range of directional applications to capture the proven advantages of Casing Drilling that have been demonstrated for vertical wells.