  We found a possible ~ 1 hour quasi-periodic oscillation (QPO) in a ~ 55 ks
X-ray observation of the narrow-line Seyfert 1 galaxy MCG--06--30--15 made with
the XMM-Newton EPIC/pn detector in the energy range 0.3 -- 10 keV. We identify
a total modulation of ~ 16% in the light curve and find a $\simeq$ 3670~s
quasi-period using Lomb-Scargle periodogram (LSP) and weighted wavelet
Z-transform (WWZ) techniques. Our analyses of eight light curves of
MCG--06--30--15, indicated the possible presence of an oscillation during one
of them. The LSP indicates a statistically significant ($\simeq$ 3$\sigma$) QPO
detection. A WWZ analysis shows that the signal at this possible roughly 3670s
period is present, and rather persistent, throughout the observation; however,
a signal around 8735s is more persistent. We briefly discuss models that can
produce X-ray QPOs with such periods in narrow line Seyfert 1 galaxies, as both
other claimed QPO detections in this class of AGN had very similar periods.
