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