  We report a nominally high-confidence $\gamma$-ray quasi-periodic modulation
in the blazar PKS 0301$-$243. For this target, we analyze its \emph{Fermi}-LAT
Pass 8 data covering from 2008 August to 2017 May. Two techniques, i.e., the
maximum likelihood optimization and the exposure-weighted aperture photometry,
are used to build the $\gamma$-ray light curves. Then both the Lomb-Scargle
Periodogram and the Weighted Wavelet Z-transform are applied to the light
curves to search for period signals. A quasi-periodicity with a period of
$2.1\pm0.3$ yr appears at the significance level of $\sim5\sigma$, although it
should be noted that this putative quasi-period variability is seen in a data
set barely four times longer. We speculate that this $\gamma$-ray
quasi-periodic modulation might be evidence of a binary supermassive black
hole.
