The dielectric constant ε' and dielectric loss ε" are measured for pure n-butyl, n-amyl, n-octyl, n-dodecyl alcohols and for concentrated solutions of n-butyl alcohol in four non-polar solvents at three frequencies between 100 and 400 MHz at three temperatures between 20 and 60 °C. The effective dipole moment has been calculated for the concentrated solutions and the results obtained are discussed. The relaxation times of the concentrated solutions of n-butyl alcohol are in general higher than that of pure n-butyl alcohol (contrary to what was found before in case of n-decyl alcohol) but decreases with increasing dilution.