Turkish authorities removed 31 mayors from the pro-Kurdish Peoples' Democratic Party (HDP) last year over alleged ties to the outlawed Kurdistan Workers' Party (PKK), just months after they won local elections in March.

Critics say the suspensions were aimed at removing political opposition to Turkey's ruling Justice and Development Party in the country's southeast after poor election results.

Adnan Selcuk Mizrakli was mayor of Diyarbakir until he was suspended in August along with the mayors of Mardin and Van.

All were replaced by government-appointed trustees. Mizrakli has been in custody since his arrest in October last year.

On Monday, the court in Diyarbakir convicted Mizrakli, who refused to attend the hearing, "of membership in an armed terror group," the Anadolu state news agency reported.

Prosecutors said he had attended the funerals of PKK militants and meetings that were used for the group's propaganda.

Mizrakli was sentenced to nine years, four months and 15 days in prison, Anadolu said.

Emma Sinclair-Webb of Human Rights Watch said Mizrakli's conviction came after just three hearings and "with no effort to probe evidence or to conceal the blatant political motivation behind this trial."

She told AFP: "The government didn't like the mayor chosen by 63 percent of the Diyarbakir electorate, so they arbitrarily removed him and jailed him."

In a statement carried by his party HDP, Mizrakli said the verdict was politically motivated.

"This is a verdict ... which has become a political tool," he said. "I do not respect it."

The government has repeatedly claimed the HDP has links to the PKK, which has fought a bloody insurgency against the Turkish state since 1984 and is listed as a terror group by Ankara and its Western allies.

The HDP says it has no official connection to the PKK but has tried to broker peace talks between the insurgents and government.

On its Twitter account, the HDP said Mizrakli was convicted on "false 'terror' charges."

"Though he won office with a landslide 63 percent of the vote, he was illegally removed in August, like dozens of other HDP mayors have been," the party commented.