Block may refer to: Objects that resemble rectangular prisms:
- A large concrete or stone brick
- Block (sailing), a single or multiple pulley used on sailboats
- Cylinder block, the main part of an internal combustion engine
- Toy block, one of a set of wooden or plastic pieces of various shapes
An area of land:
- Block (country subdivision), a unit of government in some South Asian countries
- Census block, the smallest geographical unit in the U.S. Census Bureau
- City block, an area surrounded but not divided by streets
In science:
- Block (extraction of petroleum), a sub-division of an underground reservoir
- Block (meteorology), large-scale near-stationary patterns in the atmospheric pressure field
In sports:
- Blocking (American football), when a player obstructs another player's path
- Block (basketball), when a defensive player legally deflects a shot
- Blocking (martial arts), a defensive technique in the martial arts
- Cassette (bicycle part), a set of rear sprockets that attaches to a hub on the rear wheel.
In technology:
- Block (data storage), the practice of storing electronic data in equally-sized units
- Block-level element in the internet coding language HTML
- Block (telecommunications), a unit of data transmission
- Statement block, a segment of a program
- Block (internet), technical measures to restrict users' access to certain internet resources
- Blocks (video game), an upcoming video game from EA
In mathematics:
- Block design, a kind of set system in combinatorial mathematics
- Block (group theory)
- A maximally 2-connected subgraph or a bridge with its endvertices in graph theory
In music:
- Block Entertainment, a record label
- Blocks Recording Club, a record label
- Block form
Block may also refer to:
- A way of controlling train movement in railway signalling
- Postage stamp block, an attached group of postage stamps
