Sidh may refer to:
Sidh, Gujrat, a village in the Gujrat District of Pakistan Sidh community, a caste in western Rajasthan, India Sidh, the abodes of the Aos Sí in Celtic mythology Supersingular Isogeny Diffie–Hellman Key Exchange, post-quantum public key cryptographic algorithm; see Supersingular isogeny key exchange
See also Siddha (disambiguation) Siddham (disambiguation)