Temnothorax pilagens (from Latin: pilare, "to pluck", "plunder", "pillage") is a small Nearctic species of slave-making ant in the subfamily Myrmicinae. It occurs in northeastern United States. It raids the acorn castles of other insects (Temnothorax longispinosus and Temnothorax ambiguous) and captures them as slaves and has been nicknamed the pillage ant.