Low-temperature nuclear orientation of Hg-203 by electric quadrupole interaction has been observed in graphite intercalation compounds of HgCl2. The measured electric field gradient V(zz) = -0.75(8) x 10(22) V m-2 is compared with the results on ion-implanted Hg-203 samples and also with reported values in other intercalation compounds. Advantages and disadvantages of using intercalated samples, instead of ion-implanted samples, in nuclear orientation experiments are discussed.