Estuary, a semi-enclosed body of water flowing into the sea.

Estuary English, a variety of English spoken in the south east of England.

The Estuary can mean the region of the River Thames and adjoining communities east of Central London.

Estuary, Saskatchewan is a community of Saskatchewan, Canada

Estuary (song) is an improvised song by Saccharine Trust recorded live at McCabe's Guitar Shop in Los Angeles, off of Worldbroken 12" released in 1985 on SST Records