We are proposing to build the Near Infrared Multi-Object Spectrograph (NIRMOS) for the 21.5m Giant Magellan Telescope. NIRMOS will provide R=3000 spectroscopy for a 0.5" slit in the J, H, and K passbands (0.9-2.5 um). The field of view for spectroscopy (using slit masks) is 5x7 arcminute; the field of view for imaging is 7x7 arcmin. NIRMOS will work with ground layer adaptive optics and will have 3 times the JH sensitivity and 4 times the field of view of JWST's NIRSPEC instrument.