New experimental data on relative permittivity at a frequency of 1 MHz for liquid 1-chlorohexane, 1-iodohexane, 1-iodoheptane, and 1-chlorononane from (293.15 to 373.15) K and a binary mixture of hexane + 1-chlorohexane from (293.15 to 333.15) K are reported. The uncertainty in the measured relative permittivity was +/-0.1%.