Solid state, or solid matter, is one of the four fundamental states of matter.
Solid state may also refer to:
Electronics
Solid-state electronics, using semiconductors
Solid state ionics
Solid-state drive, a data storage device
Music
Solid State Records, a Christian music label
Solid State Records (jazz label), active in the 1960s
Solid State, a musical trio with DJ Dextrous
Solid State (Leon Russell album), 1984
Solid State (Jonathan Coulton album), 2017
Solid State, an album by Sam Phillips
Science
Solid-state chemistry, the chemistry of solids
Solid-state physics, the study of how atomic-scale properties lead to large-scale properties