The quasistatic and frequency-dependent electrical conductivities below 1MHz were measured in the temperature range of 4–330K for air-stable monodispersed bundles of Mo6S3I6 nanowires pressed in the form of a sheet. The orientation of the bundles of nanowires within the sheet was approximately isotropic. The observed weak nonlinearity of the current-voltage (I-V) curves could be attributed to the electric-field-induced increase in the number of charge carriers. The temperature dependence of the quasistatic electrical conductivity shows a crossover from a three-dimensional variable-range-hopping mechanism, which dominates at higher temperatures, to a fluctuation-induced tunneling conduction below 50K. In fact, the electrical conductivity becomes almost temperature independent below 50K. The frequency dependence of the electrical conductivity obtained in the frequency range of 10−3–106Hz reveals that this crossover in the temperature dependence is a consequence of the crossover between two parallel conductivity channels. The first channel, which is governed by the three-dimensional variable-range-hopping mechanism, dominates at higher temperatures, while the second channel, governed by the tunneling mechanism, takes over at lower temperatures.