We present the measurement of the third-order nonlinearity of Bi₂O₃-B₂O₃-BaO glasses using the single Z-scan method with femtosecond laser pulses at 750-850 nm. Both third-order nonlinear refraction \gamma and two photon absorption coefficient \beta are investigated. The \gamma shows an increasing tendency with increasing BaO content, and the largest value is estimated to be 7.2×10^-14 cm²/W, which is as large as those of chalcogenide glasses. The dependence of \beta on the normalized photon energy is studied.