Saeed Laylaz, whose daily paper Sarmayeh was banned last month, was found guilty of taking part in illegal gatherings and holding classified information, Mahmoud Alizadeh-Tabatabaie was quoted on the semi-official Fars news agency as saying.
"I was informed about the verdict verbally, but as soon as I receive the formal written verdict we will have 20 days to appeal," Alizadeh-Tabatabaie said.
Iran, locked in dispute with world powers over its nuclear programme, has held several trials related to protests after the June presidential election that returned Ahmadinejad to power.
Five people have been sentenced to death and over 80 of others have been sentenced to up to 15 years in jail.
The poll plunged Iran into its most serious internal crisis since the 1979 Islamic revolution, exposing deep divisions in its ruling elite and further straining ties with the West.
A journalist and adviser to defeated presidential candidate Mehdi Karoubi, Hengameh Shahidi, was sentenced to 6 years and 3 months in jail, Karoubi's website Tagheer said on Monday.
She was found guilty of acting against national security, disturbing public order, creating and leading street riots and doing interviews with "anti-revolution" British news outlet the BBC, the website said. Shahidi was released on $90,000 bail.
Shahpour Kazemi, brother-in-law of another defeated presidential candidate and opposition leader Mirhossein Mousavi, was sentenced to one year in jail, opposition websites reported this week. He was freed on $50,000 bail.
Both verdicts are subject to appeal.
Analysts regard the trials as an attempt by the authorities to uproot the moderate opposition and put an end to mass protests such as those that erupted after the election.
(Reporting by Reza Derakhshi; Writing by Andrew Hammond; Editing by Louise Ireland)
