Block may refer to:

• A way of controlling train movement in railway signalling
• Postage stamp block, an attached group of postage stamps

Objects

• 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
• Freewheel, a set of rear sprockets that attaches to a hub on the rear wheel

Unit 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

Science

• Block (extraction of petroleum), a sub-division of an underground reservoir
• Block (meteorology), large-scale near-stationary patterns in the atmospheric pressure field

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

Technology

• Block (data storage), the practice of storing electronic data in equally-sized units
• Block-level element in the HTML markup language
• 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
• Boom Blox, a video game for the Wii console from EA, previously known as Blocks

Mathematics

• Block design, a kind of set system in combinatorial mathematics
• Block (group theory)
• In graph theory, a maximally 2-connected subgraph or a bridge with its endvertices

Music

• Block Entertainment, a record label
• Blocks Recording Club, a record label
• Block form musical form

See also

• Blocking
• Bloc