Adolphus Lewis Heermann (October 21, 1821 – September 27, 1865) was an American doctor, naturalist, ornithologist, and explorer.

He participated in the fifth Pacific Railroad Survey as the surgeon and naturalist of a group led by Lt. Robert S. Williamson and reported on the various birds along the route.

[3] Heermann was born in New Orleans, Louisiana, the oldest son of Lewis (Surgeon in the Navy, August 3, 1779 - May 1833[4]) and Eliza.

[2] From 1862 he was suffering from locomotor ataxia, a symptom of syphilis and when Henry Dresser visited San Antonio in 1863, he was able to meet Heermann and the two went riding together on collecting trips.

[2] Heermann collected specimens of birds, animals, and plants in the western United States during his expeditions and sent them to specialists, mainly at the Academy of Natural Sciences of Philadelphia.