Phenylenediamine may refer to:

  • o-Phenylenediamine or OPD, a chemical compound C<sub>6</sub>H<sub>4</sub>(NH<sub>2</sub>)<sub>2</sub>
  • m-Phenylenediamine or MPD, a chemical compound C<sub>6</sub>H<sub>4</sub>(NH<sub>2</sub>)<sub>2</sub>
  • p-Phenylenediamine or PPD, a chemical compound C<sub>6</sub>H<sub>4</sub>(NH<sub>2</sub>)<sub>2</sub>
  • N,N-Dimethyl-p-phenylenediamine or DMPD
  • N,N,N′,N′-Tetramethyl-p-phenylenediamine or TMPD, used in microbiology
  • N,N-Diethyl-p-phenylenediamine or DPD