1,3-Diphenyltriazene is the organic compound with the formula PhN=N-N(H)Ph (Ph = C6H5).

It is a prototypical triazene, i.e. a compound with the functional group RN=N-NR2.

It is a pale yellow solid, prepared by the reaction of phenyldiazonium salts with aniline.

[3] In practise, phenyldiazonium salts are also prepared from alanine, thus 1,3-diphenyltriazene can be prepared from analine in one-pot reaction via partial diazotization.

The N-N distances are 1.287 and 1.337 Å.