Jérôme Henri Carrein (French pronunciation: [ʒeʁom ɑ̃ʁi kaʁɛ̃]; 2 July 1941 – 23 June 1977) was the second-to-last convicted criminal to be executed by guillotine in France.

On 27 October, 1975 in Arleux, Northern France, Carrein, who was the father of five children and often had no fixed abode, an alcoholic, and a tuberculosis sufferer, met Cathy Petit, an eight-year-old local girl.

He was tried before the Pas-de-Calais criminal court at Saint Omer, found guilty, and sentenced to death on 12 July 1976.

Two weeks before the second trial began, Patrick Henry, another child murderer, narrowly escaped a death sentence at the criminal court in Troyes thanks to the skill of his lawyer, Robert Badinter, and public outrage in France was particularly strong.

Carrein's mercy petition was turned down in mid-June 1977 by President Valéry Giscard d'Estaing.