Xylocopa waterhousei or Xylocopa (Koptortosoma) waterhousei is a species of carpenter bee. It is endemic to Australia. It was described in 2000 by Australian entomologist Remko Leys.
Body length is 20âÂÂ26 mm; wing length 17âÂÂ21 mm. Body pubescence is bright yellow.
The species occurs in the Northern Territory in Arnhem Land and Kakadu National Park. The holotype was collected near Mudginberri homestead. Associated habitats include open monsoon forest and shrubland.
The adults are flying mellivores. Flowering plants visited by the bees include Calytrix brachychaeta.