NGC 91 (also PGC 3325956 and 2MASS: J00215163+2222055) is a magnitude +13.8 star located 2 arcmin south of NGC 90 in the constellation Andromeda.
The star was discovered by Irish astronomer R. J. Mitchell, assistant to William Parsons, 3rd Earl of Rosse, using a 182.88 cm (72 inch) speculum reflector at Birr Castle on the 26th October 1854.
