Both leaders enjoyed a lavish dinner in the Eiffel Tower
US President Donald Trump will watch American and French soldiers march together through Paris in a celebration marking Bastille Day, and 100 years since the US entered World War I.
The event, which will also feature a bi-national flypast of fighter jets to symbolise present-day military co-operation between the two countries, follows his day of talks with French President Emmanuel Macron.
Both leaders, accompanied by first ladies Melania Trump and Brigitte Macron, also enjoyed a lavish dinner at a restaurant in the Eiffel Tower.
The parade concludes a visit which Mr Macron hoped would boost France's standing on the world stage, despite disagreeing with his American counterpart on policy issues such as climate change.
At a joint news conference on Thursday, the US president had suggested his decision to pull America out of the Paris climate accord could be changed.
Mr Trump had said: "The friendship between our two nations - and ourselves, I might add - is unbreakable.
"Our occasional disagreements are nothing compared with the immortal bonds of culture, destiny and liberty that unite us... so strongly unite us."
Mr Trump has previously criticised how France has dealt with recent terror threats, but he told a reporter of his confidence that Mr Macron is "not gonna be easy on people who are breaking the laws and show tremendous violence".
He added: "I have a feeling that you're going to have a very, very peaceful and beautiful Paris... and I'm coming back."
This Bastille Day has added poignancy as it marks the first anniversary of one of the deadliest Islamist militant attacks seen in recent years.
One year ago, a Tunisian man drove a truck into a crowd on the waterfront in the Mediterranean city of Nice, killing 86 people.
Following the Bastille Day parade in Paris, Mr Macron will head to the city to attend a commemoration for those who lost their lives.