The youth was in touch with French jihadist Rachid Kassim, who is suspected of ordering or inciting the killing of a police couple in their home in June and the murder of an elderly priest in a Normandy church in July, police sources said.
Investigators were today searching the teenager's home in northeast Paris to try to ascertain whether he had been planning an imminent attack. His age was not given.
His arrest comes two days after a 15-year-old from eastern Paris was charged with conspiring to commit terrorist acts after writing on Telegram - the encrypted messaging app popular among French radicals - of his plans to commit a stabbing, sources said.
Interior Minister Bernard Cazeneuve said today that the intelligence services were "working harder than ever" to prevent assaults incited by "a number of characters in Syria who used encrypted methods to call on young people to carry out attacks."
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Kassim, 29, was also in contact with an all-female gang of radicals who have been charged with planning another attack after an apparent failed attempt to blow up a car packed with gas cylinders near Paris' Notre Dame cathedral.
France has been repeatedly targeted by Islamic extremists in the last two years.
An assault on satirical weekly Charlie Hebdo in January 2015 was followed by a rampage by IS gunmen and suicide bombers in Paris in November that killed 130 people.
More recently, a grisly truck attack on a crowd in Nice in July left 86 dead.
French Prime Minister Manuel Valls on Sunday said the terror threat was at a "maximum" and that the authorities were foiling attacks and smashing jihadist networks "every day".
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