The slender-tailed dunnart (Sminthopsis murina), also known as the common dunnart in Australia, is a dasyurid marsupial . It has an average body length of 7 to 12 centimeters (2.8–4.7 in) with a tail length of 5.5 to 13 centimetres (2.2–5.1 in). It weighs 25–40.8 grams for males and 16.5–25.4 grams for females.