North Bank Lighthouse, Maritime beacon at River Liffey mouth, Ireland

The North Bank Lighthouse is an 11-meter tall beacon with a square tower supported by concrete columns at the entrance to Dublin Port. The structure sits on a platform in the river and marks a key navigation point for vessels entering the River Liffey.

The beacon was built in 1882 as part of a network of four lights guiding ships safely into the River Liffey. This early navigation aid played a key role in securing harbor traffic during the expansion of Dublin Port in the 1800s.

The lighthouse's nickname, The Tea Caddy, comes from its square tower on concrete columns, which has also been likened to a giant mailbox on stilts. In 2015 artist Fergal McCarthy built a large-scale replica with a working green light inside Trinity College Dublin's Science Gallery for the Home/Sick exhibition. In 2017 cliff divers used the structure as a diving platform before the Red Bull Cliff Diving World Series event on Inishmore.

The light is occulting green: lit for seven seconds, dark for one, with a focal height of 10 metres and a range of 16 nautical miles. It stands in the water midway between the end of the North Bull Wall and Alexandra Quay, so it is seen from the shore or from passing vessels rather than visited. The fog bell is no longer in use.

In 2017, before the Red Bull Cliff Diving World Series event on Inishmore, cliff divers used the lighthouse as a diving platform for a display. The structure is also nicknamed The Tea Caddy, and has been described as resembling a giant mailbox on stilts.