1,2,4-Triazole (as ligand in coordination compounds, Htrz abbreviation is sometimes used) is one of a pair of isomeric chemical compounds with molecular formula C2H3N3, called triazoles, which have a five-membered ring of two carbon atoms and three nitrogen atoms.

The C-N and N-N distances fall into a narrow range 136 - 132 picometers, consistent with the aromaticity.

[6][7] Notable triazoles include the antifungal drugs fluconazole and itraconazole[8] and the plant growth regulator paclobutrazol.

[9] Triazolate is a common bridging ligand in coordination chemistry.

[10] The 3,5‑dihydroxy derivative, known as urazole, sees extensive industrial use as a blowing agent.