The infrared to visible upconversion mechanisms of Nd 3+ ions in potassium lead chloride crystal have been investigated at liquid nitrogen temperature (LNT). We have observed upconversion luminescence when pumping into both 4 F 3/2 and 4 F 5/2 bands and off-resonance, at 851 and 856nm. The main bands appearing in the emission spectra are two blue bands located at 420 and 435nm, corresponding to transitions 4 D 3/2 → 4 I 13/2 and 2 P 1/2 → 4 I 9/2 respectively, and green, orange and red emissions, located at 535, 595 and 668nm, corresponding to 4 G 7/2 – 4 G 9/2 → 4 I 9/2 , 4 I 11/2 , 4 I 13/2 transitions, respectively. The results show that, upon excitation of either the 4 F 3/2 or 4 F 5/2 band at LNT, two- and three-body energy transfer upconversion process are responsible for the emissions coming from levels 4 G 7/2 – 4 G 9/2 (535, 595, and 668nm) and 4 D 3/2 (420nm), respectively. However, the experimental data indicate that the mechanisms leading to the luminescence coming from level 2 P 1/2 depend on the pumping wavelength and sample temperature.