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Intermetallic R$_3$T$_4$X$_{13}$ series consists of cage like structure andhave been in focus due to their unconventional electronic ground states. Inthis work, we report the normal and superconducting state properties of a highquality single crystal of Lu$_3$Os$_4$Ge$_{13}$. Lu$_3$Os$_4$Ge$_{13}$ belongsto the above mentioned series and crystallizes in a cubic crystal structurewith the space group $\it{Pm\bar{3}n}$. Using electrical transport,magnetization and heat capacity measurements, we show thatLu$_3$Os$_4$Ge$_{13}$ is a type-II multi-band superconductor ($T{_c} =3.1$~K)with unusual superconducting properties. The analysis of the low temperatureheat capacity data suggests that Lu$_3$Os$_4$Ge$_{13}$ is a moderately coupledmulti-band BCS superconductor with two gaps ($2\Delta / {k{_B}T{_c}} = 3.68 \pm{0.04} ~\& ~0.34 \pm {0.02}$) in the superconducting state. Thedc-magnetization ($M-H$) shows a large reversible region in the superconductingstate similar to the vortex liquid phase observed in high-$T{_c}$superconductors. The value of the Ginzburg number $G_{i}$ suggests that thethermal fluctuations, though small as compared to those in high-$T{_c}$cuprates, may play an important role in the unpinning of the vortices in thiscompound. The electronic band structure calculations show that three bandscross the Fermi level and constitute a complex Fermi surface inLu$_3$Os$_4$Ge$_{13}$

{Multiband Superconductivity in Lu$_3$Os$_4$Ge$_{13}$