Mistimr was a Hobbit in the Third Age. He befriended Gandalf the Grey who took him to Rivendell. There he met Skargim Ironaxe who took him to the Lonely Mountain. Mistimr was uncommonly stealthy, even for a Hobbit and so he made the ideal spy for Dain, King under the Mountain. Later he became one of Skargim's most trusted allies.