The glass-forming region in the system TeO₂-BaO-TiO₂ and the crystalline phases obtained by heat treatment of glasses were examined to fabricate transparent TeO₂-based glasses containing ferroelectric BaTiO₃ crystals. The glasses containing up to 30mol% BaO and 20mol% TiO₂ were obtained. The glass transition temperatures, 341°-463°C, and crystallization temperatures, 463°-589°C, increased with increasing BaO and TiO₂ contents. By controlled crystallization, transparent 70TeO₂-15BaO-15TiO₂ glasses containing BaTiO₃ crystals with a diameter of about 5-10μm were successfully prepared. The small difference in the refractive indices, n, between the TeO₂-based glass, n=2.1, as matrix and BaTiO₃ crystals, n=2.39, leads to transparency, even though the particle size is much larger than the wavelength of visible light.