Horizon is the line at which the sky and the earth's surface appear to meet.
Horizon or horizons may also refer to:
- Horizon Global, a corporation specializing in media-compression technology, peer to peer video telephony, and video on demand
- Horizon Pipeline, a small natural gas pipeline that moves gas in northern Illinois
- Horizon Power, a corporation owned by the Government of Western Australia
- Planning horizon, the amount of time an organisation will look into the future when preparing a strategic plan
- Horizon of connectivity, the boundary in most client-server architectures that limits access to server-based resources
- NorthStar Horizon, an 8-bit computer system based on the ZiLOG Z80A microprocessor
- Split horizon, one of the methods in computer networks used to prevent routing loops
Geology, soil science and archeology
- Horizon refers to a specified layer within rock, sediment or soil; see also stratum and bed.
- Horizon Radio (UK), the pop-format Independent Local Radio station for Milton Keynes and North Buckinghamshire
- Horizon Radio, a state-owned Bulgarian Radio Station
- Radio horizon, the locus of points in telecommunication at which direct rays from an antenna are tangential to the surface of the Earth
- New Horizons, the first spacecraft expected to flyby and study the ex-planet Pluto.