Timonium may refer to:
Places
- Timonium (Paphlagonia), an ancient fort
- Timonium, Maryland
- Timonium Road, exit 16 off Interstate 83 in Maryland
- Timonium station (formerly Timonium Business Park)
- Timonium Fairgrounds and Timonium Racetrack, location of the Maryland State Fair
- Fairgrounds station (formerly Timonium Fairgrounds)
Others
- A fictional ore (see List of fictional elements, materials, isotopes and atomic particles)
- The uncompleted palace of Mark Antony in Alexandria