The man, identified as Gholam-Reza Rigi, was publicly hanged at dawn in the town of Saravan, the official news agency IRNA reported.
He was accused of drug smuggling.
Iranian authorities routinely execute dissidents on the bogus charge of drug smuggling.
Saravan is situated in the south-eastern province of Sistan-va-Baluchestan which has been a hotbed of anti-government activities.
In recent months, Iranian authorities have stepped up executions in the restive province in what many Baluchis believe is a response to a spate of attacks by dissidents on government and security officials.
