Yarramundi is a suburb of Sydney, in the state of New South Wales, Australia.

Yarramundi is located 69 kilometres west of the Sydney central business district, in the local government area of the City of Hawkesbury.

The suburb is named after Yarramundi, an Indigenous Australian of the Boorooberongal clan of the Darug people.

He was a garadyi or 'doctor' and was called by Europeans 'the chief of the Richmond Tribe'.

Following a flood which destroyed the ropeway, a railway was laid in 1927 from the existing sidings to the mine on the island.