Tube may refer to:

Electronics

• vacuum tube, a component of electronics
• cathode ray tube, a common component of electronics such as televisions and other displays
• Tube, An expansion bus on the BBC Micro computer

Food

• Yoplait Tubes, the Canadian name for Go-Gurt portable yog(o)urt

Geometry

• A hollow cylinder.

Mechanics

• pneumatic tube, transportation using compressed air
• inner tube, a part of a tire

Media

• The Tube (TV series), a music related TV series by Channel 4 in the United Kingdom
• TUBE, a Japanese pop group
• Tube (game), a freeware game from Bullfrog Productions, released in 1995
• Tube (movie), a South Korean movie
• 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
• Series of tubes, an Internet meme and analogy for the Internet used by United States Senator Ted Stevens in reference to net neutrality

Music

• The Tubes, a San Francisco-based New Wave band, popular in the 1970s and 1980s

Nature

• lava tube, found in volcanoes
• the inside of a hollow wave in surfing
• the flower tube (corolla tube)
• pollen tube

Packaging

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

Photography

• extension tube, a tool for macro photography

Plumbing

• tubing (material), used in plumbing, irrigation, and other applications

Software

• Tubes (software), a software program that combines file sharing and web publishing technologies

Structural Engineering

• Tube (structure), a structural system involved in architectural engineering to help with building stability and wind resistance.

Theatre

• Blue Man Group's theatrical show, "TUBES", now called "Rewired."

Transportation

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