Cotter

Cotter may refer to:
 * Cotter pin (disambiguation), a pin or wedge used to fix parts rigidly together
 * Cotter (farmer), the Scots term for a peasant farmer formerly in the Scottish highlands
 * Cotter (surname), a surname (including a list of people with the name)
 * Cotter, Arkansas, United States
 * Cotter, Iowa, United States
 * Mount Cotter, a mountain in California, United States
 * Cotter River, a river in the Australian Capital Territory