Benitez picks up his award having guided Liverpool to victories over Manchester City, Wigan Athletic, Chelsea and Portsmouth.
The Reds twice came from behind, against City and Wigan, then inflicted Chelsea's first home defeat in four years.
Liverpool ended the month with another win, as a late Steven Gerrard penalty proved enough to see off Portsmouth at Anfield.
Benitez has been named manager of the month four times, but has a long way to go to catch all-time record holder Sir Alex Ferguson, who has won the award 21 times in his career.
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