Muniria angustisepala is a flowering plant in the mint family Lamiaceae and is endemic to the Northern Territory.

Muniria angustisepala is shrub which grows to a height of about 2 m (7 ft) and has branches that have four corners in cross-section and are densely hairy.

Flowering occurs from January to September and is followed by fruit which is oblong but with four distinct ridges and has the sepals attached.

[2][4] In 2011, Barry Conn, Murray Henwood and Nicola Streiber described a new genus, Muniria and transferred this species to it.

[5]: 695 This species only occurs in northern parts of the Northern Territory, including in Kakadu, Limmen, and Nitmiluk National Parks in the Arnhem Plateau, Darwin Coastal, Gulf Coastal, Gulf Fall and Uplands and Pine Creek biogeographic regions.