The Mother Tantras (Tib. མ་རྒྱུད་, Wyl. ma rgyud) of the Sarma tradition are divided into:

• the Heruka Class, which includes the Chakrasamvara Tantra and Hevajra Tantra;
• the Permanence Class; and
• the Vajrasattva Class, which includes the Kalachakra Tantra.

The Mother Tantras are also sometimes categorized in six classes.

• Ringu Tulku, The Ri-me Philosophy of Jamgön Kongtrul the Great (Boston & London: Shambhala Publications, 2006), pages 86-93.

• Father Tantras

Category of Tantras