Vajra Mushti (Sanskrit vajramuṣṭi वज्रमुश्टि) is a Sanskrit bahuvrihi compound translating to "one who is grasping a thunderbolt" or "one whose clenched fist is like a diamond". It is a name of Indra mentioned in the Ramayana epic.
In Tantric Buddhism Vajra Mushti is the name of a specific mudra (hand gesture). In Shingon Buddhism, it is also the name of a specific Bodhisattva mentioned in the Vajrasekhara Sutra.