A woman’s body was found stuffed in a duffel bag inside her Manhattan apartment on Thursday afternoon, police and law enforcement sources said.

Nadia Vitel, 52, was found unconscious and unresponsive inside her Kips Bay apartment at 206 East 31st Street around 4:30 p.m. during a welfare check by police, the NYPD said.

She was pronounced dead at the scene.

The wellness check was prompted by concerned relatives who called authorities, police and a source told The Post.

Vitel’s cause of death will be determined by the Office of the Chief Medical Examiner.

It is not yet known if criminality was suspected as the investigation is ongoing, police said.