Plywood, sometimes called multiplex, a covering material made by bonding layers of veneer with the grain of wood of each layer at a right angle to the next layer

Multiplexing, combining many signals into a single transmission circuit or channel

Multiplexer, or Multiplexor or Transmission Multiplexor or Transmission Multiplexer, an electronic device that combines multiple inputs

Multiplex (company), a large Australian based group of property and construction companies notable for its involvement in significant construction projects

Concurrency (road), sometimes called a multiplex, a single physical road designated by two or more different highway numbers

Multiplex (juggling), a form of toss juggling with multiple balls thrown and/or caught at one time by the same hand

Multiplex (comics), a DC Comics character

Multiplex Modelsport, a manufacturer of radio control equipment and radio-controlled airplanes

Multiplex (TV), a group of digital TV channels that are mixed together for broadcast

Multiplex (movie theater), a type of movie theater with a large number of screens (see also megaplex)

Multiplex (webcomic), an online comic about the staff of a movie theater