Pura Ulun Danu is a major Hindu Shaivite temple in Bali, Indonesia.
The temple complex is on the shores of Lake Bratan in the mountains near Bedugul.
The water from the lake serves the entire region in the outflow area; downstream there are many smaller water temples that are specific to each irrigation association.

The temple itself was named after the Goddess Danu, the queen of water, who is also the goddess of beauty and fertility.