Blanche Cave, Show cave in Naracoorte Caves National Park, South Australia.

Blanche Cave is a karst cave about 250 m long in Naracoorte Caves National Park, South Australia, with three chambers. Its first chamber is a low, oblong hall lit by an opening at the far end; pale cream and tan limestone walls carry long, downward-tapering stalactites in close vertical rows, and short white stalagmites rise along the sloping floor.

European settlers discovered the cave in 1845 when Benjamin Sanders encountered it while searching for missing sheep in the Naracoorte region. This discovery marked the beginning of European awareness and recorded history for the site.

Candlelit New Year's Eve parties were held in the cave from the 1860s, and remains of the old benches can still be seen near the entrance. In 2000 the Olympic torch passed through and was handed over inside, with the cave lit by more than 1000 candles. A 2003 production of A Midsummer Night's Dream was staged here.

Access to the cave is available through scheduled guided tours where informative guides explain limestone formations and geological features within the protected environment. It is advisable to wear comfortable shoes and prepare for cool, damp conditions inside.

The cave once contained mummified remains of an Indigenous person, removed without permission in 1861 and never returned to the site. This tragic part of the location's history remains an important element of understanding the place today.