  We present results of searches for vector and pseudo-scalar bosonic
super-WIMPs, which are dark matter candidates with masses at the keV-scale,
with the XENON100 experiment. XENON100 is a dual-phase xenon time projection
chamber operated at the Laboratori Nazionali del Gran Sasso. A profile
likelihood analysis of data with an exposure of 224.6 live days $\times$ 34\,kg
showed no evidence for a signal above the expected background. We thus obtain
new and stringent upper limits in the $(8-125)$\,keV/c$^2$ mass range,
excluding couplings to electrons with coupling constants of $g_{ae} >
3\times10^{-13}$ for pseudo-scalar and $\alpha'/\alpha > 2\times10^{-28}$ for
vector super-WIMPs, respectively. These limits are derived under the assumption
that super-WIMPs constitute all of the dark matter in our galaxy.
