The Yuma myotis (Myotis yumanensis) is a species of vesper bat. Yuma myotis occur in a variety of western lowland habitats where it forages for insects just above the surface of slow moving water. It eats a variety of soft-bodied insects, primarily moths. It is found in British Columbia, Mexico, and the western United States. It averages 78 millimetres (3.1 in) long and weighs 4–8 grams (0.14–0.28 oz), and is similar to Myotis occultus.