  We experimentally demonstrate control of molecular rotation in bulk
superfluid $^4\mathrm{He}$. Metastable helium dimers, $\mathrm{He}_2^*$, are
rotationally excited by a periodic train of linearly polarized femtosecond
laser pulses. We show that the degree of rotational excitation of
$\mathrm{He}_2^*$ can be enhanced or suppressed by varying the period of the
pulse train, whereas the directionality of molecular rotation can be controlled
by the relative angle between the polarization vectors of pulses in the train.
The experimental results are in agreement with numerical calculations, based on
a simple model, in which $\mathrm{He}_2^*$ molecules do not interact with the
superfluid.
