The ceremony at the Cathedral Church of Saint John the Divine is planned for 10 a.m. Thursday. It comes after a private wake for the former star of "The Sopranos" on Wednesday in New Jersey.
The 51-year-old actor died of a heart attack last week while vacationing in Italy with his son.
Broadway theaters paid tribute by dimming their lights briefly Wednesday night. Gandolfini was nominated for a Tony Award in 2009 as an actor in "God of Carnage."