The Saudi embassy in Kuwait is suing a Kuwaiti MP who criticised military action against the Houthi rebels in Yemen, Kuwait Times reported.
Shia MP Abdulhameed Dashti made the offending comment during an interview on a television station owned by Lebanese Shia group Hezbollah.
Saudi Arabia has led airstrikes against the Shia Houthis.
Its lawsuit claims Dashti’s criticism of the strikes insulted the kingdom, the embassy claims.
It is the second case the kingdom has filed against Dashti. In the first, he was accused of insulting both the kingdom and the Saudi monarchy.
Meanwhile, a court has upheld the acquittal of Sunni Islamist activist Abdullah Al Nafisi who was prosecuted for insulting Shias, Kuwait Times said.
The case against outspoken former MP Saleh Al Mulla, who is accused of insulting Egyptian President Abdel Fattah Al Sisi during his visit to Kuwait is due to be heard on October 4.
Al Mulla wrote on several Twitter comments that he objected to Kuwait giving more funds to Egypt. He was detained for five days before being released on bail.