In this work, TiO₂ (0–50 vol%) nanoparticles (25 nm) were added to a 11.7Li₂O·12.6ZrO₂·68.6SiO₂·7.1Al₂O₃, LZSA (4 μm) glass-ceramic matrix to prepare composites in order to investigate the influence of TiO₂ on the sinterability, crystallinity and some properties to obtain information to design materials for low temperature co-fired ceramics (LTCCs) applications. The sintered composites (700–1000 °C/30 min) with relative densities between 95% and 98%, showed β-podumene,TiO₂ and L_i2TiSiO₅ as main crystalline phases. The maximum bending strength (235±84 MPa) was achieved for composites with 40% TiO₂ sintered at 1000 °C/30 min. The coefficient of thermal expansion increased linearly with the concentration of TiO₂, i.e., 3.5×10⁻⁶ °C⁻¹ for 0% TiO₂ and 9.5×10⁻⁶ °C⁻¹ to 100% TiO₂. The values of thermal conductivity were low and increased with the increase of the volumetric fraction of TiO₂, reaching a maximum (3.30 W/mK) for samples (40% TiO₂) sintered at 1000 °C/30 min. The measurements of electrical conductivity indicate that the obtained materials are electrical insulators (~10⁻¹⁰ S cm⁻¹).