The No.9 started all four of Liverpool's victories in the month, delivering two assists and scoring against Southampton and Burnley.
His classy finish at Turf Moor last Saturday saw him become the first Brazilian to score 50 Premier League goals.
He will battle Sergio Aguero, Ashley Barnes, Kevin De Bruyne, Teemu Pukki and Raheem Sterling for the accolade.
You can cast a vote for Firmino by clicking here.