William John Ansorge (6 April 1850 – 31 October 1913 at Luanda[1][2]) was a physician who worked in Angola and Uganda and is known for exploring the fauna of the African region.

He travelled across Africa (northern Angola, Benguella, Mossamedes, Portuguese Guinea) and wrote Under the African Sun in 1899.

[7] Ernst Hartert noted that Ansorge was a very valuable collector and contributor to the bird collection of Walter Rothschild at Tring.

Hartert noted that Ansorge's knowledge of the species collected was limited and that he lacked training in zoology.

Hartert notes that he died in Luanda, Angola at just 64, although appearing much older with his white beard.