Former City Council Speaker Melissa Mark-Viverito is in the running to become the city’s next public advocate.

She’ll launch her campaign with a kickoff event at 6 p.m. Tuesday at the Borough of Manhattan Community College, she said in a statement Tuesday.

Mark-Viverito, who represented parts of the Bronx and East Harlem as a council member, said in a statement that she will lay out her “vision for Public Advocate as a champion for ignored subway riders, NYCHA residents and undocumented immigrants.”

Letitia James will leave the post in January after being elected earlier this month as the state attorney general.

Mayor Bill de Blasio, who also once served as public advocate before entering City Hall, is expected to call a special election to fill the post after the first of the year.

Brooklyn Councilmen Rafael Espinal and Jumaane Williams, Assemblymen Michael Blake and Daniel O’Donnell, activist and journalist Nomiki Konst and Columbia University professor Davis Eisenbach are also candidates for the office.