Abstract. The differential extinction technique is applied to derive the extinction law in LMC over the optical (BVR bands) and IR (IJHK bands) wavelength range. For this purpose we select photometric sample consisting of 46 red supergiants with moderate and similar extinction on the RSG's branch and 19 extra reddened RSGs. The parameter space was thoroughly investigated in order to obtain the A_λ/A_V distribution most consistent with the Cardelli, Clayton & Mathis model. The most typical total-to-selective extinction ratio in LMC R_V equals 2.7 ± 0.4 and differs from the canonical Galactic value with a significance of only 1 σ.

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