  The $^{232}$Th neutron-induced fission cross section was evaluated from 500
keV to 200 MeV. The experimental $^{232}$Th fission cross sections and their
ratios to the $^{235,238}$U fission cross sections in the EXFOR library were
reviewed and analysed by the least-squares method. The newly published
$^{232}$Th/$^{235}$U fission cross section ratios from the time-of-flight
measurements at the CERN n_TOF and CSNS Back-n facilities were compiled in
EXFOR. Additional simultaneous evaluation was performed by including the
experimental $^{233,238}$U and $^{239,240,241}$Pu fission cross sections and
their ratios. The new evaluation provides the $^{232}$Th fission cross section
systematically lower than the JENDL-5 cross section. The reduction is 4% in the
plateau region between 2 and 6 MeV and more significant in the subthreshold
fission region. The present evaluation reduces the $^{232}$Th fission cross
section averaged over the $^{252}$Cf spontaneous fission neutron spectrum from
the JENDL-5 evaluation by 4%, which is closer to the other general purpose
libraries but underestimates Grundl et al's measurement by 11%.
