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There are relatively few experimental determinations of permanent electric dipole moments of transition metal containing polyatomic molecules. Here, we report a study of numerous branch features in the $B2\Sigma +,001\leftarrow X2\Sigma +,000$ band of LaNH using high-resolution optical Stark spectroscopy. A supersonic molecular beam sample was prepared by using a pulsed laser vaporization/reaction scheme in which lanthanum vapor was reacted with ammonia. Preliminary analysis of the Stark shifts results in $\mu =2.2$ D for the $X2\Sigma +$ state and a much smaller value for the $B2\Sigma +$ state. A comparision with ScNH and the diatomic Group 3 metal oxides will be given.