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.

Drone, missile attack on Kyiv injures 26, damages buildings
BBC apologises to Trump over speech edit but rejects defamation claim
Indian Prime Minister Modi's alliance set to easily win Bihar vote
India's top court asks lawyers to argue online as air quality worsens
Bangladesh on edge ahead of verdict in ousted PM Hasina's trial
