He has filed his nomination from the Central Chennai constituency.
Mr Karnan was the first sitting judge to be convicted for contempt of court. He underwent a six-month prison sentence after his retirement in June 2017.
He also said that he has declared himself as the Prime Ministerial candidate.
"Why not AIADMK or DMK declare some one amongst themselves as a Prime Ministerial candidate?" he said.
In May 2018, Justice Karnan had launched a political party, ‘Anti Corruption Dynamic Party’. Subsequently, there were unconfirmed reports that the party would contest elections in the 2019 General Election.