Barton Springs, Historic district in Travis County, United States.

Barton Springs is a set of four natural springs on Barton Creek in Zilker Park, fed by the Edwards Aquifer through Cretaceous limestone roughly 100 million years old. The largest, Main Barton Spring, lies submerged near the diving board of Barton Springs Pool; Eliza, Old Mill and Upper Barton Spring are smaller and sometimes dry up. The pool is bordered by a layered limestone embankment patched with moss and by a curved, tiered concrete retaining wall.

Barton Springs is the main discharge point of the Barton Springs segment of the Edwards Aquifer, a karst aquifer in limestone about 100 million years old. The Barton Creek National Archeological and Historic District was formed in 1985. In the early 20th century, amphitheater-style swimming enclosures were built around Eliza Spring and Old Mill Spring; both structures are now closed to the public.

The springs sit on the grounds of Zilker Park, and the surrounding Barton Creek area was listed as a National Archeological and Historic District in 1985. The main spring is also called Parthenia, "the mother spring", while Eliza Spring is known as Concession Spring and Old Mill Spring as Sunken Gardens or Zenobia Spring.

Access runs through the adjacent Zilker Park grounds, which work well for a longer stay with picnicking or walking. Restroom facilities are available, and different depth sections make swimming comfortable for visitors with varying experience.

The springs provide a natural habitat for the Barton Springs Salamander, a species that exists only in these specific waters. This small salamander lives deep in the spring system and is found nowhere else in the world.