| Western harvest mouse | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Chordata | 
 
| Class: | Mammalia | 
 
| Order: | Rodentia | 
 
| Family: | Cricetidae | 
 
| Subfamily: | Neotominae | 
 
| Genus: | Reithrodontomys | 
| Species: | R. megalotis | 
| Binomial name | 
| Reithrodontomys megalotis 
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| Synonyms | 
| Reithrodon megalotis (Baird, 1858)Reithrodontomys amoles A.H. Howell, 1914Reithrodontomys arizonensis J.A. Allen, 1895Reithrodontomys aztecus J.A. Allen, 1893Reithrodontomys dychei J.A. Allen, 1895Reithrodontomys dychei subsp. nebrascensis J.A. Allen, 1895Reithrodontomys megalotis subsp. arizonensis J.A. Allen, 1895Reithrodontomys megalotis subsp. distichlis von Bloeker, 1937Reithrodontomys megalotis subsp. limicola von Bloeker, 1932Reithrodontomys megalotis subsp. ravus Goldman, 1939Reithrodontomys megalotis subsp. santacruzae Pearson, 1951Reithrodontomys saturatus subsp. alticolus Merriam, 1901Rhithrodontomys catalinae Elliot, 1904Rhithrodontomys peninsulae Elliot, 1903
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The western harvest mouse (Reithrodontomys megalotis) is a small neotomine mouse native to most of the western United States. Many authorities consider the endangered salt marsh harvest mouse to be a subspecies, but the two are now usually treated separately.