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.

Putin and Modi discuss trade, peace in New Delhi summit
Indian air travel crippled as IndiGo's pilot crisis enters fourth day
Lebanon says ceasefire talks aim primarily at halting Israel's hostilities
US to widen travel ban to more than 30 countries, Noem says
Putin visits Delhi as Russia, India seek to increase and diversify trade
