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.

Israeli fire kills three people in Gaza as truce deal staggers
Cuban forces kill 4 exiles who attacked from Florida speedboat
Hong Kong court overturns China critic Lai's fraud conviction in rare legal victory
Hillary Clinton to testify in congressional Epstein probe
Death toll from Brazil floods rises to 46, 21 people still missing
