We classify the dual bipartite Q-polynomial distance-regular graphs of diameter d greater than or equal to 5 which are not bipartite. Results of Curtin and Nomura give a classification of the dual bipartite Q-polynomial distance-regular graphs of diameter d greater than or equal to 6 which are bipartite. This completes a classification of the dual bipartite Q-polynomial distance-regular graphs of diameter d greater than or equal to 6. (C) 1996 Academic Press Limited