Baltimore Beacon, Navigation beacon in County Cork, Ireland.

Baltimore Beacon is a white-painted rubble-stone cone about 50 feet (15 m) high and 15 feet (4.6 m) across at its base, topped by a red-painted metal sphere. It stands on a cliff some 160 feet (49 m) above the sea, marking the channel between the mainland and Sherkin Island at the entrance to Baltimore Harbour.

The beacon was built in 1848 to replace an earlier warning structure that had guided ships through dangerous coastal waters. It has served as a steady navigation aid for vessels entering Baltimore Harbour ever since.

Locally the beacon is called "Lot's Wife", after the biblical figure turned into a pillar of salt. The nickname has carried into local life: the Southern Star ran a Baltimore column titled "From Baltimore Beacon", and businesses took the name, among them the now-closed Beacon Park Hotel. Couples get engaged, and even married, at the spot.

The beacon stands on a cliff top about 3 km south-west of Baltimore, marking the harbour entrance; the walk out from the village takes roughly 25 minutes. The site is open and free to visit, with no facilities or railings at the cliff edge. The Commissioners of Irish Lights are named as managers, though ownership was disputed in the 2010s after the beacon was declassified as a navigational tool.

The wreck of HMS Looe, a 17th-century ship, lies at the foot of the cliff below the beacon. The vessel sank in 1697 after striking rocks near the harbour entrance, and its remains rest in the waters the beacon was later built to mark. Divers and historians have recorded the site, which predates the 1848 beacon by more than a century.