Boris Karlovich Stegmann (or Shtegmann) (Russian: Борис Карлович Штегман: 25 December 1898 – 28 December 1975) was a Russian ornithologist of German descent who worked on zoogeography and introduced the idea of faunal affinities or "faunal types" to subdivide the palearctic region. An influential comparative anatomy of the avian forelimb was published posthumously.