Deniz Goktas was detained on Thursday for questioning at Istanbul's main airport on his return from a trip abroad, days after prosecutors launched an investigation into his comedy show, which had been widely viewed online.
He was formally arrested following questioning by prosecutors on Friday, the state-run Anadolu Agency reported.
The routine, recorded in Istanbul last month, drew 9.5 million views after being uploaded to YouTube on June 24.
The pro‑government newspaper Sabah said dozens of viewers were offended by jokes on religion and filed complaints, prompting the investigation.
During questioning, Goktas, 32, said he had no intention of degrading religious values or insulting the president, stressing that his approach was satirical.
Asked about a quip in which he described Erdogan as having evolved from a "shy dictator" to one "confident in his identity," the comedian said the remark reflected a topic widely debated in Turkey, according to excerpts of his testimony published by the rights‑focused news portal Bianet.
Insulting the president is a criminal offence in Turkey, punishable by up to four years in prison.
Erdogan has consolidated power during more than two decades in office, and critics say he has steadily narrowed the space for free expression.
The Turkish Human Rights Association said on X that judicial harassment targeting freedom of expression had become a systematic practice in Turkey and was increasingly being used to suppress dissenting views.
Journalists and government critics frequently face investigation, detention or prosecution.
Istanbul mayor Ekrem Imamoglu, Erdogan's main political rival, has been imprisoned since March last year and is on trial on corruption charges.
Hundreds of mayors and other officials from the main opposition party are also under prosecution over corruption allegations while the party's leader was deposed by a court order - moves critics say are aimed at neutralising the party ahead of the next elections.
Erdogan's government insists that Turkey's courts are impartial and act independently of political pressure.
Dozens of people gathered at the courthouse in solidarity with the comedian on Friday, chanting anti‑government slogans, according to the opposition‑leaning newspaper Cumhuriyet.
