Downtown may soon be getting a brand new W Hotel.

The Post has learned that developer Joseph Moinian is in serious discussions to open a hotel with the alphabetically charming name at 123 Washington St.

“We have heard the W as well as other chains coming Downtown,” said Eric Deutsch, president of the Alliance for Downtown Lower Manhattan.

Moinian has approvals for a new, 56-story building that would include 120 hotel rooms on the bottom and 184 – likely luxury – apartments on top.

Plans filed with the Building Dept. also call for a fifth-floor roofdeck bar and lounge, a ground-floor restaurant, meeting rooms and a health club.

The 289,129 foot tower would rise 631 feet – about one-third the height of the nearby Freedom Tower. But it would still take a significant spot on the skyline, just south of the World Trade Center site.

Moinian did not return calls by press time.