Police Commissioner William Bratton says he will march in the nation’s largest St. Patrick’s Day parade.

That will make him one of the few high-profile city officials to walk along Fifth Ave. on March 17.

Mayor Bill de Blasio, City Council Speaker Melissa Mark-Viverito and Public Advocate Letitia James are among the city’s elected officials who are boycotting.

They are refusing to march because of a parade rule prohibiting gay groups from carrying identifying signs. Other groups, such as colleges and civic organizations, can carry such signs.

Bratton, who’s Irish-American, was asked if he was planning to march during an unrelated press conference in Manhattan on Thursday. He simply said “yes” and did not elaborate.

More than two million people are expected to attend the parade.