Barium titanate (BaTiO3) [1] is a promising material because of its strong intrinsic ultrafast optical nonlinearities, electro-optic behavior, and physical tolerance. These properties provide a platform for realizing ultrafast optical control in optoelectronic devices, allowing various architectures for communications and signal processing applications. Nonlinear phenomena have been broadly investigated on the bulk form as well as at the nanoscale. However, a systematic study on the nonlinear optical responses of BaTiO3 nanoparticles (NPs) is still lacking. Here, nonlinear optical (NLO) properties of BaTiO3 NPs film using intensity dependent femtosecond Z-scan technique [2], were investigated. We found an exceptional nonlinear switching behavior in BaTiO3 NPs (size ~90 -100 nm) from saturable absorption (SA) to reverse saturable absorption (RSA) through a distinct M-pattern at 800 nm which is near to the two-photon absorption band (3.2 eV). Further increasing the excitation intensity shows that the nonlinear absorption (NLA) behavior of the NPs is efficiently modified from M-pattern to pure RSA. The multi-stage NLA phenomenon is assigned to the interchange of simultaneous one photon-SA follows excitation absorption, pure two photon absorption and three photon absorption effects. Three-photon absorption phenomena at 800 nm is attributed to the combination of two-photon absorption and excited state or free carrier absorption process. The two- and three-photon absorption coefficients are estimated to be ≈410 cm/GW and ≈13 cm3/GW2, respectively, which are two order of magnitude larger than those of bulk crystals and lower sized BaTiO3 NPs [3, 4]. Additionally, we report the broadband third order nonlinear optical properties of BaTiO3 NPs film achieved using spectral dependent Z-scan studies. These BaTiO3 NPs exhibited strong two-photon absorption cross-section ∼107 GM in the 700 nm – 950 nm spectra region. The superior and switching NLO effects indicated that these materials might be utilized for potential applications, including multiphoton-based imaging, optical modulator, and all-optical switching devices.