The 60-year-old singer, who has a four-year contract with the hotel, suffers from labrum tears in his hips — a painful condition exacerbated by his high-energy performances, publicist Carol Marshall said in a statement Sunday.
Manilow will continue performing through his appearance at the Emmy Awards on Aug. 27 and will then have outpatient arthroscopic surgery at a Southern California hospital, Marshall said.
Recovery and rehabilitation time is expected to be about eight weeks.
Manilow will miss about 20 concerts at the Hilton, all of which will be rescheduled for the 2007 season.
He is scheduled to return in mid-October for the launch of his new album, "The Greatest Songs of the Sixties."