The O's won all four of their league fixtures during the month, scoring 10 goals and conceding just once, to maintain their promotion push.
It is the second time Slade has won the award this season having also been named top boss for August.
He told the club's official website: "It's a nice award for all of us and is not just for me but for all the players and the staff at the club.
"We had a great month in the league and though we haven't quite got February off to the best of starts, we continue to go in the right direction which is really pleasing."
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