Ayya may refer to:
- Ayya Vazhi, A South Indian Dharmic belief system.
- Ayya (2005 Tamil film), a 2005 Tamil language film directed by Hari
- Ayya (2005 Kannada film), a 2005 Kannada film starring Darshan and Rakshitha
- Ayya (Pali word), Ayya, the Pali term, translated as "honourable" or "worthy," commonly used in reference to ordained female Buddhist monks
- Ayyappan, the son of Vishnu ("Ayya") in his Mohini avatar and Shiva ("Appa")
- Vishnu, whose Tamil name is Ayya
- Ayya Vaikunda Avataram (Incarnation of Vaikundar), Hindu festival celebrated by followers of Ayyavazhi on the 20th day of Tamil Month of Masi
- Ayya Vaikundar, Ayya, reference to the deva, Vaikundar, believed to be the incarnation of Trimurthi in Ayyavazhi