H. polymorpha may refer to:
Hansenula polymorpha, a methylotrophic yeast Hedypnois polymorpha, a dandelion native to areas from Canary Islands to Iran Heterolocha polymorpha, a geometer moth Heteropurpura polymorpha, a sea snail Hydra polymorpha, an athecate hydroid Hydrostachys polymorpha, an aquatic plant Hymenachne polymorpha, a true grass Hyphomonas polymorpha, a psychrophilic bacterium Hypoestes polymorpha, a Paleotropical plant