The Nigeria international received 40% of the total votes.
Ainas international teammate Taiwo Awoniyi won the award in August.
The 26-year-old has been a consistent performer for the Tricky Trees following his departure from Serie A club Torino in the summer.
Capable of playing on either flank, the versatile full-back has operated on both the left and right side of defence so far this season, producing a string of solid displays.
He has made five league appearances for Nottingham Forest this season.
Aina was on Monday named in Nigerias squad for this months friendlies against Saudi Arabia and Mozambique.
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