Triplex may refer to:

• Triplex (building), a dwelling composed of three units
• Triplex (espionage), code name of a British World War II espionage operation
• Triplex (film), a 1991 French film
• Triplex (genetics), triple-stranded DNA
• Triplex (juggling), a three-ball throw
• Triplex locomotive, a type of locomotive
• Triplex (typeface)
• Triplex Safety Glass, a brand of laminated glass
• D-type Triplex (New York City Subway car), a 3-section articulated New York City Subway Car
• White Triplex, a 1920s speed record car
• Triplex, a Concurrency (road), where one road bears three numbers
• Triplex (mathematics), a type of Hypercomplex number
• Triplex, a cinema multiplex with three screens
• Triplex (software), a visual editor for React (software) Three Fiber

• Triplex, a synonym of the sea snail genus Chicoreus
• Geastrum triplex, a fungus
• Givira triplex, a caterpillar and moth
• Metasia triplex, a caterpillar and moth
• Micrathetis triplex, a caterpillar and moth
• Mycobacterium triplex, a bacteria
• Phyllonorycter triplex, a caterpillar and moth
• Rinzia triplex, a shrub
• Terinebrica triplex, a caterpillar and moth

• All pages with titles containing Triplex
• Triple X (disambiguation)
• Triplex Cones, a group of volcanic cones in British Columbia, Canada