Sial refers to the composition of the upper layer of the Earth's crust.
Sial may also refer to: Places Sial, Kapurthala, Punjab State, India Sial, Khyber Pakhtunkhwa, Pakistan Sial Sharif, a small village in Pakistan
Other uses Air Sial, Sialkot, Pakistan, expected to begin operations in 2019 Sial (tribe), a Jat tribe of the Punjab region Heer Sial (disambiguation) Sialkot (disambiguation) Swiss International Air Lines