Pacer Varun Aaron led side bundled out Haryana for 133 and chased down the paltry target in 29.4 overs, thanks to Ishank Jaggi (62 not out) and Kumar Deobrat (39 not out).
It was Jharkhand's third win in four matches and they now lead the group with 12 points.
Dhoni, who is playing domestic cricket after eight years, effected a run out in his side's emphatic win. He had made 44 against Gujarat in an earlier match here. The other two innings fetched him 9 and 19 runs.