  The X-ray spectra of intermediate polars can be modelled to give a direct
measurement of white dwarf mass. Here we fit accretion column models to NuSTAR
spectra of three intermediate polars; V709 Cas, NY Lup and V1223 Sgr in order
to determine their masses. From fits to 3-78 keV spectra, we find masses of
$M_{\rm WD}=0.88^{+0.05}_{-0.04}M_{\odot}$, $1.16^{+0.04}_{-0.02}M_{\odot}$ and
$0.75\pm0.02M_{\odot}$ for V709 Cas, NY Lup and V1223 Sgr, respectively. Our
measurements are generally in agreement with those determined by previous
surveys of intermediate polars, but with typically a factor $\sim2$ smaller
uncertainties. This work paves the way for an approved NuSTAR Legacy Survey of
white dwarf masses in intermediate polars.
