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We present the first results of searches for axions and axion-like-particleswith the XENON100 experiment. The axion-electron coupling constant, $g_{Ae}$,has been probed by exploiting the axio-electric effect in liquid xenon. Aprofile likelihood analysis of 224.6 live days $\times$ 34 kg exposure hasshown no evidence for a signal. By rejecting $g_{Ae}$, larger than $7.7 \times10^{-12}$ (90\% CL) in the solar axion search, we set the best limit to date onthis coupling. In the frame of the DFSZ and KSVZ models, we exclude QCD axionsheavier than 0.3 eV/c$^2$ and 80 eV/c$^2$, respectively. Foraxion-like-particles, under the assumption that they constitute the wholeabundance of dark matter in our galaxy, we constrain $g_{Ae}$, to be lower than$1 \times 10^{-12}$ (90\% CL) for mass range from 1 to 40 keV/c$^2$, and setthe best limit to date as well.

First Axion Results from the XENON100 Experiment