  We identify the probable optical counterpart of the SMC supersoft source,
RX~J0059.2-7138, with a $\sim$~14th magnitude star lying within the X-ray error
circle. We present high resolution optical spectroscopy, which reveals strong
HI emission and HeI absorption, indicative of a Be star. This classification is
consistent with the colours we derive from optical photometry. We thus find
evidence to support the existing tentative identification of this object as a
Be/X-ray binary, the first of its kind to exhibit luminous supersoft X-ray
emission.
