The Constitutional Court ruled Friday to formally end Park's presidency over a huge political scandal involving her and her longtime confidante. By law, South Korea must hold a national vote to find her successor within two months of the ruling.
The Ministry of Interior said Wednesday that May 9 has been chosen as the date for the election.
Moon Jae-in, a liberal opposition leader who lost the 2012 presidential election to Park, is the favorite to be the country's next leader in opinion surveys.