Cornelis W. "Kees" Moeliker (born 9 October 1960) is a Dutch biologist and former curator and director of the Natural History Museum Rotterdam.

[3] Moeliker's father worked for forty years as a technical illustrator for the (subsequently superseded) Dutch post office.

[7] Moeliker also collaborated on the research led by the high-profile Biology/Ornithology Professor Kees Heij, undertaken at the Free University (Amsterdam) into the population ecology of the House Sparrow (Passer domesticus) in Rotterdam.

Kompanje, Moeliker identified and described a subspecies of Long-tongued nectar bat (Macroglossus minimus booensis), of which the known habitat is restricted to the little Island of Boo in the east of Indonesia.

[19][20] He was nominated in 2013 for the Edgar Doncker Prize in recognition of his outstanding contribution to the Rotterdam Natural History Museum and to conservation more generally.

[3] On one tour, on 11 March 2014, a mini-opera based on his study entitled The Homosexual Necrophiliac Duck Opera was premiered at Imperial College London.

[12] During the programme the presenter John Lloyd observed that Kees Moeliker did not have an English-language Wikipedia page but only a Dutch-language one.