Six 1-alkoxymethyl-3-hydroxypyridinium, 1-alkoxymethyl-3-(dimethylamino)pyridinium, and 1-alkoxymethyl-4-(dimethylamino)pyridinium saccharinate ionic liqs. were studied for surface activity in aq. soln. Their crit. micelle concns. were of the same order as that of cationic surfactants because of self-assemblying in aq. solns.