François Louis Nompar de Caumont La Force, comte de Castelnau (25 December 1810 – 4 February 1880) was a French naturalist, known also as François Laporte or Francis de Castelnau.
The standard author abbreviation Castelnau is used to indicate this person as the author when citing a botanical name., and zoological names other than insects.
However, Laporte is typically used when citing an insect name (e.g.,), or Laporte de Castelnau (e.g.).