H. niger

H. niger may refer to:
 * Helleborus niger, the Christmas rose or black hellebore, a plant species
 * Hemiargyra niger, a tachinid fly species
 * Hyoscyamus niger, the henbane or stinking nightshade, a plant species found in Eurasia
 * Hippotragus niger, the sable antelope, a mammal species found in the wooded savannah in East Africa