The Crosh is a location in the parish of Lonan on the Isle of Man. The name derives from the Manx word for cross, and the site may be connected to the ancient practice of summoning the militia by passing a wooden cross from neighbour to neighbour, or to one of the parish's numerous sites of early Christian significance.

The word carried more than one sense. The Manx grammars give crosh as a cross and also as an accident, with the genitive ny groshey. The crosh cuirn, the rowan cross, was the one the fishermen used: on May Eve it was put into every boat, the men travelling miles inland to get the wood, and it was then hidden somewhere in the boat and had to stay there until the following May Eve.

Crosses of stone marked the Island's oldest church sites. The Manx ballad of the bishops says of St German that a cross of stone stands at his feet in his own church at Peel, and St Maughold's Cross still stands at the gate of his churchyard, the reputed sanctuary for criminals in old time and the one relic on the Island carrying the Three Legs.