长爪沙鼠（学名：Meriones unguiculatus）为鼠科沙鼠属的动物。

体长11.5～13.5厘米，尾长9～10.5厘米。体背为赤黄色，腹面为白色，毛基部灰色；尾为棕黄色，尾端的毛束为黑色；爪为黑色。

Meriones unguiculatus, the Mongolian jird or Mongolian gerbil is a rodent belonging to subfamily Gerbillinae. It is the most widely known species of the gerbil subfamily, and is the usual gerbil species to be kept as a pet or experimental animal, when it is known as the domesticated gerbil. Like the Syrian or golden hamster, it was first brought to the United States in 1954 by Dr. Victor Schwentker for use in research. Forty-four pairs were caught in Mongolia and brought to England. They were described as "squirrel colors... with long furry tails." They are somewhat larger than mice, with a body about 12 cm long (and a tail of similar length), with body mass averaging 50-55 grams in females and 60 grams in males.