Brachiacantha tau, the t-marked larkspur lady beetle, is a species of lady beetle in the family Coccinellidae.

In the Brachiacantha genus, the oval-shaped shiny beetles are usually about 2-3 mm in length.

The larvae are not usually encountered because they feed on scale insects within ant colonies.

Adults are sometimes found on flowers or hunting within foliage in North America.

This Coccinellidae-related article is a stub.