High-frequency alternating current stimulation can induce a rapid and reversible nerve block, specifically in motor fibers. Our objective is to investigate the effects of 10 kHz high-frequency alternating current on resting tremor versus sham stimulation in people with Parkinson’s disease (PwPD). We present preliminary results of a crossover, randomized trial involving PwPD with tremor. Active stimulation was applied at 10 kHz for 20 min over the upper limb and was compared with sham stimulation. A sample of n = 4 PwPD was included. The active intervention reduced the resting tremor in all participants, showing a reduction with respect to baseline during stimulation (5.7 × 10–3 G2/Hz; SD 7.7 × 10–3). However, the sham intervention reduced the resting tremor in only 2 participants, with a slight change during stimulation (0.6 × 10–3 G2/Hz; SD 7.1 × 10–3). This finding suggests modulation of resting tremor through a partial blockade of Aα nerve fibers. The use of KHFAC may reduce the impact of tremor on daily living activities, offering a safe and easily applicable intervention. Future studies should address the duration of KHFAC effects.