In this study, effects of a BaO–ZnO–B2O3–SiO2 (BZBS) glass on the ferromagnetic properties of Li0.43Zn0.27Ti0.13Fe2.17O4 ferrites were systematically investigated. Through the solid-state reaction process, it was observed that a pure spinel phase was obtained with the sintering temperature raging from 880 °C to 920 °C, indicating the compatibility of co-firing with silver. Results revealed that the addition of BZBS glass significantly promoted grain growth and enhanced ferromagnetic properties of the Li0.43Zn0.27Ti0.13Fe2.17O4 ferrites. With an optimized addition of BZBS glass (2.0 wt.%), the saturation induction was increased from ∼100 to 285 mT and the FMR line width at 9.3 GHz was dramatically reduced from ∼800 to 275 Oe. This study indicates that BZBS glass is a promising candidate for low temperature co-fired ceramics (LTCC).