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