Tube may refer to:

Object

• cathode ray tube, a common component of electronics such as televisions and other displays
• cylinder (geometry), a hollow shape
• inner tube, a component of vehicular tires
• pneumatic tube, a method of transportation utilising compressed air
• test tube, a piece of laboratory equipment used in science
• Tube, An expansion bus on the BBC Micro computer
• tubing (material), used in plumbing, irrigation, and other applications
• vacuum tube, a component of electronics

Packaging

• Tube (packaging), a packaging solution for pasty and viscous goods such as toothpaste

Structural Engineering

• Tube (structure), the predominate structural system for constructing tall buildings in the United States between World War II and the 1990’s.

Transportation

• The London Underground, London’s subterranean train system.
• Transbay Tube, an underwater rail tube across the San Francisco Bay

Nature

• lava tube, found in volcanoes
• the inside of a hollow wave in surfing
• the flower tube

Media

• The Tube (TV series), a music related TV series by Channel 4 in the United Kingdom
• The Tubes, a San Francisco based rock group
• TUBE, a Japanese pop group
• Tube (game), a freeware game from Bullfrog Productions, released in 1995
• Tube (movie), a South Korean movie (튜브 (영화)).
• Tube, a children’s programme with inflatable characters on SABC, South Africa
• Tube & Berger, the alias of Dance/Electronica producers Arndt Rörig and Marco Vidovic from Germany
• YouTube, a website that allows users to upload, view, and share video clips
• Peter ‘Tubes’ Dale, aka Tubes from the Soccer AM television show.
• Pornotube

File-sharing

• Tubes (filesharing), a file-sharing program.

Theatre

• Blue Man Group’s theatrical show, “TUBES”, now called “Rewired.”