Baiomys, the New World pygmy mice, is a genus of rodents in the family Cricetidae. Together with Scotinomys, it forms the tribe Baiomyini. It contains the smallest rodents in North America. It currently contains three extant species:

Additionally, there are seven known fossil species:

  • Baiomys aquilonius Zakrzewski, 1969
  • Baiomys brachygnathus (Gidley, 1922)
  • Baiomys intermedius Packard & T. Alvarez, 1965
  • Baiomys kolbi Hibbard, 1952
  • Baiomys minimus (Gidley, 1922)
  • Baiomys rexroadi Hibbard, 1941
  • Baiomys sawrockensis Hibbard, 1953
  • Amman, B R., R. D. Bradley. 2003. Molecular evolution in Baiomys (Rodentia: Sigmodontinae): Evidence for a genetic subdivision in B. musculus. Journal of Mammalogy 85:162-166.
  • Integrated Taxonomic Information System . Retrieved 3 April 2007.