Duplex (film), an US 2003 film starring Ben Stiller and Drew BarrymoreDuplex (band), a Dutch electronic music duoDuplex! (Canadian band), a Canadian children's music bandThe Duplex, an American comic strip by Glenn McCoy
Science and medicine
Duplex (moth), a genus of mothsNucleic acid double helix, a double-stranded molecule of DNA or RNA
Technology
Duplex, a common electrical receptacle with two NEMA type 5 connector plugsDuplex locomotive, a type of steam locomotiveTGV Duplex, a French high-speed train of the TGV family featuring bi-level carriagesDuplex printing, double-sided printingDuplex (telecommunications), communication flowing in both directions simultaneously
Other
Duplex (building), a two-unit apartment building or condominiumEdward Duplex
