Cameron said that he was "shocked" by the gun and bomb attacks.
"Our thoughts and prayers are with the French people. We will do whatever we can to help," he said on Twitter.
The Foreign Office said it is "urgently investigating" whether any British nationals have been caught up in the shootings or hostage-taking.
There will be "strengthened policing at ports" and more police at public events in the coming days, UK police said.
Meanwhile, Queen Elizabeth II has sent her condolences to French President Francois Hollande.
"Prince Philip and I have been deeply shocked and saddened by the terrible loss of life in Paris. We send our most sincere condolences to you, the families of those who have died and the French people," she said.
Downing Street said Cameron would chair a meeting of the government's Cobra emergency committee in the wake of the attacks.
France was rocked by multiple, near simultaneous attacks on entertainment sites around Paris last evening that claimed over 120 lives.
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