Eugene Hermann Plumacher (died 1910) was U.S. consul to Maracaibo from 1877 until 1890. He was born in Prussia and emigrated to the U.S. where he settled in Tennessee. He survived a bout of yellow fever and relayed reports on upheavals and conflicts in the region which is now part of Venezuela. He studied lepers and leprosy, postulating that it was a hereditary condition. He also served as a university professor in Tennessee. He retired from his consul position in 1910 and died in Washington D.C. the same year.