  We report site disorder driven ferromagnetic ordering of nearly 8$\%$ Ce
atoms in single crystalline Ce${_3}$Os${_4}$Ge$_{13}$ below 0.5~K.
Ce${_3}$Os${_4}$Ge$_{13}$ crystallizes in a cubic structure with space group
$\it{Pm\bar{3}n}$. The structural analysis shows the presence of site-disorder
in the system, where 2(a) Ge site is partially occupied by the Ce atoms. Due to
the small Ce $4f$-ligand hybridization, these Ce atoms are in the Ce$^{3+}$
(magnetic) state while rest of the Ce atoms in the unit cell are in
Ce$^{4-\delta}$ (non-magnetic) state. The heat capacity shows a peak below
0.5~K corresponding to the ferromagnetic ordering of the Ce$^{3+}$ moments. The
ferromagnetic ordering below 0.5~K is also seen in the ac-susceptibility data.
At low temperatures (1.8~K$\leq T\leq 6$~K), the magnetization shows $log(T)$
dependence, whereas the resistivity shows power law ($T^n$) temperature
dependence indicating the non-Fermi liquid behavior of the quasiparticles.
