Jules Petiet (5 August 1813 – 29 January 1871) was a French mechanical engineer who worked on the early development of the French railway network.
He was the Chief Engineer of the Chemins de Fer du Nord from 1845, and became a locomotive engineer from 1848.
From 1868 until his death, he was head of the prestigious engineering school École Centrale Paris, of which he was also a graduate.
Petiet's name is one of the 72 names inscribed on the Eiffel tower.
A street in Paris, rue Petiet (at Épinettes, 17th district) is named in his honour.