The long-tailed hopping mouse (Notomys longicaudatus) is an extinct species of rodent in the family Muridae.

[3] The cause of extinction is unknown,[2] but may be a variety of factors including predation and habitat alteration.

According to John Gould, the long-tailed hopping mouse liked raisins very much, but it was not considered a pest like its relatives.

Long-tailed hopping mice would stay near farms and grocery stores because of the decrease in food the rapid populating was causing.

The last known report of a live long-tailed hopping mouse was in 1901, when a captive individual died at an Adelaide scientific lab.