Spit Junction is an urban locality in the suburb of Mosman in Sydney, New South Wales, Australia.

Spit Junction is in the local government area of the Municipality of Mosman and is part of the Lower North Shore.

The area had been known as Trafalgar Square, from the name of a block of shops built at the corner of Spit Road and Military Road.

It features a supermarket, grocery shops, bookshop, gift shops, cafés, health practitioners, and offices.

This article related to the geography of Sydney is a stub.