Militant Aymen Smiri blew himself up on Tuesday evening after security forces surrounded him in the Tunisian capital's Intilaka neighbourhood.
There were no other casualties, officials confirmed.
"Following a long chase, special forces surrounded the terrorist," the interior ministry said in a statement. "When forces began shooting, he blew himself up with an explosive belt he was wearing."
It's the third such incident within a week, which comes months ahead of an election and at the peak of the tourist season.

Venezuela's Maduro in custody, Trump says US will run the country
Numerous teenagers among the dead identified in Swiss bar blaze, police say
South Korea's Lee begins China state visit after North fires missiles
At least 25 dead, 14 missing in Nigeria boat accident, officials say
