Stack may refer to:
Science
- Stack (mathematics), a sheaf that takes values in categories rather than sets
- Stack (geology), a large vertical column of rock in the sea
- Stacking (chemistry), or pi stacking, attractive, noncovalent interactions between aromatic rings
Computing
- Stack (abstract data type), abstract data type and data structure based on the principle of last in first out
- Stack (C++), a C++ standard container, simulating a stack
- Call stack, stack data structure that stores information about the active subroutines of a computer program
- Stack-based memory allocation, a memory allocation scheme based on the principle of last in first out
- Protocol stack, a particular software implementation of a computer networking protocol suite
- Solution stack, a group of software systems, increasing in abstraction from bottom to top
- Stack (Haskell), a tool to build Haskell projects and manage their dependencies
- Stacks (Mac OS), a folder view on the Dock of macOS
Transportation
- Stack interchange, a free-flowing grade separated junction between two roads
- The Stack, the interchange of I-10 and I-17 in Phoenix, Arizona
- Operation Stack, parking lorries on the M20 in Kent, England when Channel crossings are disrupted
People
- Stack (surname) (including a list of people with the name)
- Brian "Stack" Stevens (1941–2017), Cornish rugby player
- Stacks (rapper) (born 1985), stage name of the rapper Yannique Barker
- Stack Pierce (1933–2016), American actor and baseball player
Other uses
- Library stack, compactly spaced bookshelves in libraries
- Amp stack, of guitar amplifiers
- Smoke stack or chimney
- Flue-gas stack, the industrial terminology for an industrial plant chimney
- Funnel (ship), the smokestack or chimney on a ship
- Stack magazine, a bimonthly publication about high school sports
- Stack (unit), a US unit of volume for stacked firewood
- Consonant stacking, a feature of some South Asian writing systems
- Stacks (album), a 2005 album by Bernie Marsden
See also
- All pages beginning with Stack
- All pages with a title containing Stack
- Haystack (disambiguation)
- Stacker (disambiguation)
- Stacking (disambiguation)
- Stak (disambiguation)
- Stack effect, the movement of air into and out of buildings, chimneys, flue-gas stacks, or other containers
- Stack Island