Modi, who earlier in the day arrived in New York from San Jose on the last-leg of his US visit, first met Cameron to begin a day of hectic parleys and discussions.
The prime minister later met Hollande. Microsoft co-founder Bill Gates also joined Modi and Hollande for discussions.
"Look who dropped by! Missed in Silicon Valley, the original tech entrepreneur @BillGates says hello to PM & President," External Affairs Ministry Spokesperson Vikas Swarup tweeted along with pictures of Modi, Hollande and Gates engaged in discussions.
"Connecting with a nation (France) that has been a valued friend for years and years...," the PMO tweeted.
Image: Prime Minister Narendra Modi met with French President Francois Hollande. Photograph: MEA/ Twitter