Indriya (literally "belonging to or agreeable to Indra") is the Sanskrit and Pali term for physical strength or ability in general, and for and specifically refers to the five spiritual faculties, the five or six sensory faculties, and the twenty-two phenomenological faculties.

Indriya, literally "belonging to or agreeable to Indra," chief deity in the Rig Veda and lord of the Trāyastriṃśa heaven (also known as Śakra or Sakka in Buddhism), hence connoting supremacy, dominance and control, attested in the general meaning of "power, strength" from the Rig Veda.

In Buddhist Sanskrit and Pali the term generally refers to physical strength or ability in general, and more specifically to the five spiritual faculties, the five or six sensory faculties, or the twenty-two phenomenological faculties.

In the Pali Canon's Sutta Pitaka, the "five spiritual faculties" (Pali: pañc' indriyāni), which contribute to an awake state of mind, are:^{[citation needed]}

SN 48.10 is one of several discourses that characterizes these spiritual faculties in the following manner:

In SN 48.51, the Buddha declares that, of these five faculties, wisdom is the "chief" (agga).

The five faculties are listed in the seven sets of qualities lauded by the Buddha as conducive to Enlightenment.

In AN 6.55, the Buddha counsels a discouraged monk, Sona, to balance or "tune" his spiritual faculties as one would a musical instrument: