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The man was identified by judicial sources as Chinese-American Xiyue Wang, a 37-year-old researcher from Princeton University.
Wang was arrested last August as he tried to leave the country, according to the judiciary's news agency.
The US State Department called on Iran to release all those held on "fabricated" charges.
The sentence was announced on state TV by deputy judiciary chief Gholamhossein Mohseni-Ejeie.
Mizanonline, the Iranian judiciary's official news agency, said Wang was part of "an infiltration project" that sought to gather "highly confidential articles" for US and British institutions including the US State Department, Princeton University, Harvard Kennedy School and the British Institute of Persian Studies.
"Before his arrest he was able to digitally archive 4,500 pages of the country's documents while under covert surveillance," the agency said.
Earlier this year, the authorities in Tehran said as many as 70 people they described as spies were serving sentences in the capital's jails.
The identities of only a handful have been made public.
"This person, who was gathering information and was directly guided by America, was sentenced to 10 years in prison, but the sentence can be appealed," Mr Ejeie said on Sunday.
He said the decision was taken by an Iranian court, without giving any further details.
In a statement, the US Department of State did not refer to any specific person but called on Iranian authorities to release all foreign citizens it is holding "unjustly... so they can return to their families".
"The Iranian regime continues to detain US citizens and other foreigners on fabricated national security-related charges," an official said.

Experts reassembled pieces of tiles found amid tons of earth from the site known to Jews as the Temple Mount and to Muslims as Haram al-Sharif.
They say the tiles date from the period of the Second Temple, during the time of King Herod about 2,000 years ago.
The temple was destroyed by the Romans in 70 AD during a Jewish rebellion.
Some 600 segments of coloured stone floor have been found since archaeologists began examining the debris from the hilltop site in 2004.
The plateau where the temples stood is the most sacred site in Judaism. It is joined by the Western Wall, venerated by Jews as part of the original supporting wall of the temple compound.
Haram al-Sharif (Noble Sanctuary) is also the place where Muslims believe the Prophet Muhammad ascended to Heaven, and is the third holiest site in Islam.
The archaeologists say the tiles probably came from porticos in the temple's courtyards.
Piecing the fragments together "enables us to get an idea of the Temple's incredible splendour", said Dr Gabriel Barkay of the Temple Mount Sifting Project.
Experts say they managed to assemble seven potential designs of how the flooring could have looked like. The type of flooring is known as opus sectile, Latin for "cut work", and "considered to be far more prestigious than mosaic tiles floors", according to Frankie Snyder, from the project's team.
"The tile segments were perfectly inlaid such that one could not even insert a sharp blade between them," she said.
The Temple Mount Sifting Project was established by Israeli archaeologists in 2004 to examine debris dumped by Islamic authorities following expansion work at an underground mosque on the compound.
The project attracts thousands of visitors each year who participate in finger-tip searches of the earth and has so far turned up hundreds of ancient relics, including coins, animal bones and pieces of pottery.
Here is a full list of winners and nominees for the 2017 Bafta TV Awards, which have taken place in London.
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A US national has been sentenced in Iran to 10 years in prison on spying charges, Iranian officials have said.
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Archaeologists in Jerusalem say they have for the first time reconstructed likely designs of a Biblical Jewish temple floor using original fragments.