  We report Suzaku observations of the active, Compton-thick Circinus galaxy.
Observations were obtained with both the X-ray Imaging spectrometer (XIS) and
the Hard X-ray Detector (HXD). Below 10 keV, the nuclear spectrum is dominated
by radiation reflected from cold dense gas of high column density, while above
13 keV the radiation is directly transmitted nuclear emission seen through a
column density of $~ 4 x 10^{24} cm^-2. In the 0.2--10 keV band, the XIS
spectrum is contaminated at 5% level by the brightest off-nuclear source in
Circinus (CG X-1), but drops to 1% in the 5-10 keV and is negligible at higher
energies. We find no significant evidence for variability in the hard (>12 keV)
emission. The Circinus is marginally detected with the HXD/GSO in the 50--100
keV band at 2.5\sigma level. We model the 3-70 keV band XIS+PIN spectra with a
four components: the Compton transmitted nuclear emission, the reflected
nuclear emission, a soft power law (representing a combination of scattered
nuclear emission, extended emission and contamination by sources in the galaxy
below a few keV). The hard nuclear power-law is found to have a photon index
Gamma_h ~= 1.6, very similar to the soft power-law. The high energy cut-off is
E_C ~= 49 keV. These results agree with those from BeppoSax. An extrapolation
of this model up to the GSO band shows good agreement with the GSO spectrum and
supports our detection of the Circinus up to ~= 100keV.
