Quadruplex

Quadruplex may refer to:
 * Quadruplex (New Orleans), a softball complex in New Orleans City Park
 * Quadruplex telegraph, an improvement on the electrical telegraph patented in 1874 by Thomas Edison
 * Two-inch quadruplex videotape, the first practical and commercially successful videotape format
 * G-quadruplex, a four-stranded nucleic acid structure rich in guanine
 * C-quadruplex, a four-stranded nucleic acid structure rich in cytosine, found in I-motif DNA
 * Quadruplex, a building split into four apartments, similar to a duplex
 * Quadruplex locomotive, a locomotive with four sets of driving wheels