Mud Bay may refer to:
Places Mud Bay, Alaska Mud Bay, British Columbia Mud Bay, Goodenough Island, New Guinea Mud Bay, Kitsap County, Washington, United States, on the Kitsap Peninsula Mud Bay, Thurston County, Washington, United States
Companies Mud Bay (store), a pet store in the Pacific Northwest
See also Blue Mud Bay, Northern Territory, Australia Bay mud, thick deposits of silty clay saturated with water