Leptalestes

{{Short description|Extinct genus of mammals in the infraclass Metatheria}}

{{Taxobox

| image =

| image_caption =

| regnum = Animalia

| phylum = Chordata

| classis = Mammalia

| subclassis = Theria

| infraclassis = Metatheria

| genus = Leptalestes

| genus_authority = Davis, 2007

}}

Leptalestes is an extinct genus of mammals in the infraclass Metatheria. It was described by B.M. Davis in 2007. A new species, L. toevsi, was described from the late Cretaceous period of the United States by John P. Hunter, Ronald E. Heinrich, and David B. Weishampel in 2010.{{cite journal|doi=10.1080/02724631003763490|title=Mammals from the St. Mary River Formation (Upper Cretaceous), Montana|year=2010|last1=Hunter|first1=John P.|last2=Heinrich|first2=Ronald E.|last3=Weishampel|first3=David B.|journal=Journal of Vertebrate Paleontology|volume=30|issue=3|pages=885–898}}