Flame resistant fabrics that have incorporated into them cellulosic filament yarns. The cellulosic filament yarns may be flame resistant (either inherently FR or treated so as to be FR) or non-flame resistant. Fabrics according to some embodiments are formed entirely of cellulosic filament yarns. However, fabrics according to some embodiments include additional yarns to ensure that the fabric complies with NFPA 1971 and/or 2112.