Speaking to journalist in Paris, the socialist leader said Trump's recent war of words with the Muslim parents of a U.S. soldier who was killed in action, were "hurtful and humiliating comments."
"His excesses make you want to retch, even in the United States, especially when — as in the case with Donald Trump — he speaks ill of a soldier, of the memory of a soldier," Hollande told journalists in Paris, according to various media reports.
"If the Americans choose Trump, (it) will have consequences, because an American election is a world election," he added.
Trump has courted controversy throughout his campaign to secure the Republican nomination having offended Mexicans, Muslims and women with a series of contentious policies and unguarded comments. For others fed up with the political establishment however, Trump represents a breath of fresh air.
Needless to say, Trump is a polarizing figure for voters and politicians in the U.S. and those watching his progress from afar.
Hollande's comments come after Italian Prime Minister Matteo Renzi told CNBC on Monday that he would prefer Democrat Hillary Clinton to win the election in November, saying it was an "obvious" choice.
"I think it is obvious for me and for a lot of us to prefer Hillary Clinton as commander-in-chief, because with her, there is a woman able to know every dossier, able to have a history and a future with all the partners," Renzi told CNBC on Monday.