"There are French among the victims and also many foreigners from every continent and many children, young children," said a clearly moved Hollande in a speech from a hospital in the French Riviera city.
France's Hollande denounces third 'terrorist' act in 18 months
"As I speak 84 people are dead, and around 50 are in a critical condition between life and death," he added.
Witnesses said a truck drove at speed into a crowd for two kilometres (1.3 miles) after around 30,000 people had been watching a fireworks display on France's national day.
Hollande previously described the attack on the palm-lined Promenade des Anglais as being of an "undeniable terrorist nature".
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