Tandem is an Latin adverb meaning "at length" or "one behind another". In English, the term was originally used for two or more draft horses harnessed one behind another as opposed to side-by-side. By extension the term now refers to any team (of animals or people) working together one behind another, or more generally any group of persons or objects working together. As of 2006 the strict sense of the team being all in one line is gradually being lost in English.

By further extension the term tandem is frequently used as a noun to mean an item of equipment, such as a tandem bicycle, built for a team working in tandem. Alternatively, tandem has been used in the real estate world to describe items such as lengthwise two-or-more-car garages, etc.

Tandem may also refer to:

• Tandem signaling
• Tandem skydiving
• Tandem Computers
• Tandem accelerator - see Particle accelerator
• Tandem bicycle

Tandem | Tandem (homonymie) | Tandem