Former President Bill Clinton will swear in Bill de Blasio as New York City's 109th mayor during Wednesday's inaugural ceremony at City Hall, the mayor-elect's transition team said Saturday.

Hillary Clinton, a former secretary of state and a former U.S. senator from New York, will be joining her husband at the noon event. Mr. de Blasio previously worked for the couple, serving in the U.S. Department of Housing and Urban Development during Mr. Clinton's administration and later managing Mrs. Clinton's successful Senate campaign...