The Trinity House Obelisk (also known as Trinity House Landmark) is an obelisk located at Portland Bill, on the Isle of Portland, Dorset, England. It has been a Grade II Listed Monument since September 1978. The obelisk was created as a daymark.
The 7 metre tall obelisk was built in 1844 to warn ships of the rocks off the coast of Portland Bill. It stands at the southern tip of the Isle of Portland, and also acts as a warning of the low shelf of rock extending 30 metres south into the sea.
The obelisk, made of Portland stone, is dated 1844 on its north face, which is inscribed "TH 1844". It is a three-sided tapering obelisk on a high plinth and with a pyramidal crown. The monument was saved from threatened demolition in 2002, after Trinity House deemed the monument too expensive to maintain.
Coordinates: 50°30′48″N 2°27′24″W / 50.5132°N 2.4567°W